In industrial processes, ammonia (NH₃, 17.04 g/mol) is manufactured by combining nitrogen (N₂) and hydrogen (H₂) through a method known as the Haber process. 18.32 kg of H₂ is the mass of H₂ that should be used to produce 34.0 kg of NH₃ with a yield of 33.0%.
To determine the mass of H₂ required to achieve a final yield of 34.0 kg NH₃ with a yield of 33.0%, we need to use stoichiometry and the concept of percent yield.
The balanced equation for the production of ammonia from nitrogen and hydrogen is:
N₂ + 3H₂ → 2NH₃
According to the equation, 3 moles of hydrogen (H₂) are required to produce 2 moles of ammonia (NH₃).
Given:
Desired yield of NH₃ = 34.0 kg
Yield percentage = 33.0%
First, we calculate the theoretical yield of NH₃ based on the given yield percentage:
Theoretical yield of NH₃ = Desired yield / Yield percentage
Theoretical yield of NH₃ = 34.0 kg / (33.0/100) = 103.03 kg
Next, we determine the moles of NH₃ in the theoretical yield:
Moles of NH₃ = Theoretical yield / Molar mass of NH₃
Moles of NH₃ = 103.03 kg / 17.04 g/mol = 6045.74 mol
Since the stoichiometric ratio of H₂ to NH₃ is 3:2, we can calculate the moles of H₂ required:
Moles of H₂ = (3/2) × Moles of NH₃
Moles of H₂ = (3/2) × 6045.74 mol = 9068.61 mol
Finally, we convert the moles of H₂ to mass:
Mass of H₂ = Moles of H₂ × Molar mass of H₂
Mass of H₂ = 9068.61 mol × 2.02 g/mol = 18,324.35 g
Converting grams to kilograms:
Mass of H₂ = 18,324.35 g / 1000 = 18.32 kg
Therefore, the mass of H₂ that should be used to achieve a final yield of 34.0 kg NH₃ with a yield of 33.0% is approximately 18.32 kg.
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Complete question :
Ammonia (NH₃, 17.04 g/mol) is industrially produced from N₂ and H₂ using the Haber process. What mass of H₂ should be used if 34.0 kg NH₃ must be the final yield when the reaction is run under conditions that produce only a 33.0% yield?
18.3 kg 3.03 kg 6.05 kg 6.05 kg. You selected this answer. 36.6 kg 8.91 kg
Balance the following redox reaction in acidic solution with the lowest possible whole number coefficients. What is the coefficient in front of NO in the balanced reaction? Zn (s) + HNO3 (aq) → Zn2+ (aq) + NO (g)
According to the question the coefficient in front of NO in the balanced reaction is 1.
What is reaction?Reaction is the process of responding to a stimulus. It is a type of behavior that happens in response to a situation or an event. Reactions are typically a combination of physiological and psychological responses and can be either conscious or unconscious. Reactions can range from something as small as a facial expression to a full-blown emotional episode. Reaction time, which is the amount of time it takes to respond to a stimulus, is an important measure of how quickly a person can process information.
The balanced redox reaction in acidic solution is:
2Zn (s) + 2H⁺ (aq) + 2NO³⁻ (aq) → 2Zn²⁺ (aq) + NO (g) + H₂O (l)
The coefficient in front of NO in the balanced reaction is 1.
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What elements must have at least 8 electrons (with the exception of radicals) but can accommodate more than 8 electrons?
Elements that must have at least 8 electrons (with the exception of radicals) but can accommodate more than 8 electrons are elements in the third row and beyond.
This is because elements in the third row and beyond have d-orbitals in addition to s- and p-orbitals, allowing them to expand their octet and accommodate more than 8 electrons. For example, sulfur (S) has 6 valence electrons and can accommodate up to 12 electrons in its valence shell by using its d-orbitals. This is seen in the sulfate ion (SO4^2-), which has 32 valence electrons (6 from sulfur and 4x6 from oxygen). Other elements in the third row and beyond, such as phosphorus (P), chlorine (Cl), and iodine (I), can also expand their octet and accommodate more than 8 electrons in certain compounds.
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For an isothermal process, the entropy change of the surroundings is given by the equation: a. AS = -asys b. AS = qsys c. AS = - q InT d. AS = q InT e. AS = -qsys /T
This equation represents the entropy change of the surroundings for an isothermal process, where AS is the entropy change of the surroundings, qsys is the heat absorbed or released by the system, and T is the temperature of the surroundings in kelvin. The correct answer is E) AS = -qsys/T.
The negative sign indicates that the entropy of the surroundings decreases for exothermic processes (qsys < 0) and increases for endothermic processes (qsys > 0).
This equation is derived from the second law of thermodynamics, which states that the total entropy of an isolated system always increases over time, and for reversible processes, the total change in entropy is zero.
Therefore, the entropy change of the surroundings is equal in magnitude and opposite in sign to the entropy change of the system.
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which of the following isotopes contain 12 neutrons in their nucleus? select all that apply. multiple select question. na1123 ne1022 c612 mg1225 need help? review these concept resources.
The isotopes containing 12 neutrons in their nucleus are Na-23 and Mg-25.
To determine which isotopes have 12 neutrons, we'll use the formula: Number of neutrons = Mass number - Atomic number. For each isotope given (Na-23, Ne-22, C-12, and Mg-25), we'll calculate the number of neutrons:
1. Na-23: Sodium has an atomic number of 11. Neutrons = 23 - 11 = 12.
2. Ne-22: Neon has an atomic number of 10. Neutrons = 22 - 10 = 12.
3. C-12: Carbon has an atomic number of 6. Neutrons = 12 - 6 = 6.
4. Mg-25: Magnesium has an atomic number of 12. Neutrons = 25 - 12 = 13.
Based on these calculations, the isotopes with 12 neutrons are Na-23 and Ne-22.
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The student is now told that the four solids, in no particular order, are aluminum chloride (AlCl3), sugar(C6H12O6), acetic acid (CH3COOH), and sodium bromide (NaBr). Assuming that conductivity is correlated to the number of ions in solution, rank the four substances based on how well a 0.20 M solution in water will conduct electricity.
Sodium Bromide (NaBr): This is a strong electrolyte and will conduct electricity very well in a 0.20 M solution in water.
What is electrolyte?An electrolyte is a material that, when dissolved in a polar solvent like water, creates an electrically-conducting solution. Salts, acids, or bases make up the majority of electrolytes. Salts like sodium, potassium, chlorine, calcium, and magnesium are examples of electrolytes.
1. Sodium Bromide (NaBr): This is a strong electrolyte and will conduct electricity very well in a 0.20 M solution in water.
2. Aluminum Chloride ([tex]AlCl_3[/tex]): This is a weak electrolyte and will conduct electricity fairly well in a 0.20 M solution in water.
3. Acetic Acid ([tex]CH_3COOH[/tex]): This is a weak electrolyte and will conduct electricity moderately in a 0.20 M solution in water.
4. Sugar ([tex]C_6H{_12}O_6[/tex]): This is a nonelectrolyte and will not conduct electricity in a 0.20 M solution in water.
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To create a buffer that maintains a pH around 7.54, which solution would you choose?A. CH3COOH and NaCH3COO B. HClO and KClOC. NaOH and HCN D. HNO3 and KNO3Can you explain the concept and how to get the answer?
To create a buffer that maintains a pH around 7.54, you would choose solution A: CH3COOH and NaCH3COO.
A buffer solution is designed to maintain a relatively constant pH when small amounts of acids or bases are added to it. To create a buffer, you need a weak acid and its conjugate base or a weak base and its conjugate acid. This allows the buffer to resist changes in pH by neutralizing added acids or bases.
In this case, CH3COOH (acetic acid) is a weak acid, and NaCH3COO (sodium acetate) is its conjugate base. The acidic and basic components work together to maintain the pH near the pKa of the weak acid, which for acetic acid is approximately 4.74.
To adjust the pH to 7.54, you need to choose the appropriate ratio of the weak acid and its conjugate base, according to the Henderson-Hasselbalch equation:
pH = pKa + log10([A-]/[HA])
Where pH is the desired pH, pKa is the acid dissociation constant, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid. In this case:
7.54 = 4.74 + log10([NaCH3COO]/[CH3COOH])
Solving for the ratio of [NaCH3COO]/[CH3COOH] will give you the necessary proportions to achieve a pH of 7.54 with the chosen buffer solution. The other options, B, C, and D, do not include a weak acid or weak base and their conjugate pairs, making them unsuitable for creating a buffer solution.
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the pressure of a sample of gas is measured at sea level with a closed-end manometer. the liquid in the manometer is mercury. determine the pressure of the gas in:
To determine the pressure of the gas, we need to first understand how a closed-end manometer works. A closed-end manometer measures the pressure difference between the gas sample and the atmospheric pressure. The liquid in the manometer (in this case, mercury) rises in one end of the tube due to the pressure of the gas and the difference in height between the two ends of the tube indicates the pressure difference.
At sea level, atmospheric pressure is typically around 101.3 kPa. If we measure the height difference of the mercury in the manometer, we can use the formula P = pgh (where P is pressure, p is density, g is gravity, and h is the height difference) to calculate the pressure of the gas.
Assuming the height difference is 10 cm, and the density of mercury is 13,600 kg/m³, the pressure of the gas can be calculated as:
P = (13600 kg/m³) x (9.81 m/s²) x (0.1 m) = 13366 Pa or 13.4 kPa
Therefore, the pressure of the gas sample at sea level is approximately 13.4 kPa.
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which statement best describes the law of conservation of mass?(1 point) responses chemical symbols are used to show atom balance before and after a reaction. chemical symbols are used to show atom balance before and after a reaction. reactants and products cannot escape from a closed system. reactants and products cannot escape from a closed system. reactants in a chemical reaction rearrange to form a new substance or substances. reactants in a chemical reaction rearrange to form a new substance or substances. matter cannot be created or destroyed in a chemical reaction. matter cannot be created or destroyed in a chemical reaction.
The statement that best describes the law of conservation of mass is "matter cannot be created or destroyed in a chemical reaction."
The law of conservation of mass, also known as the principle of mass conservation, states that the total mass of a closed system remains constant throughout any chemical reaction. This means that the mass of the reactants, which are the substances that undergo the reaction, must be equal to the mass of the products, which are the substances formed after the reaction.
Consequently, matter cannot be created or destroyed during a chemical reaction, and the total mass is conserved. The other statements provided do not accurately represent the law of conservation of mass, as they involve chemical symbols, closed systems, or the rearrangement of reactants, which are different aspects of chemical reactions.
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in a punnet square of gibbs free energy, what goes on top and what goes on the sides?
In a punnet square of Gibbs free energy, Delta S values are on top. Delta H is are on the side.
The power related to a chemical response that may be used to do work. The unfastened power of a device is the sum of its enthalpy (H) plus the made of the temperature (Kelvin) and the entropy (S) of the device. The extrade in Gibbs unfastened power (ΔG) is the most quantity of unfastened power to be had to do beneficial work. If ΔG > 0, the response is nonspontaneous withinside the route written. If ΔG = 0, the response is in a nation of equilibrium. If ΔG < 0, the response is spontaneous withinside the route written.
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Which mobile phase was better for dye separation? Do the results support the predictions?
The mobile phase with isopropyl alcohol was better for dye separation. The results support the predictions.
In paper chromatography, the mobile phase plays a crucial role in separating the components of a mixture. In this experiment, two mobile phases were used - isopropyl alcohol and water. The results showed that the isopropyl alcohol mobile phase was better for dye separation than water. This is because isopropyl alcohol has a higher polarity than water and therefore, can better dissolve the dye components, allowing for better separation. The results were consistent with the predictions made based on the polarity of the dyes and the mobile phases used.
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The ideal gas law tends to become inaccurate when Multiple Choice a the pressure is lowered and molecular interactions become significant. b the pressure is raised and the temperature is lowered. c the temperature is raised above the temperature of STP. d large gas samples are involved e the volume expands beyond the standard molar volume.
The ideal gas law tends to become inaccurate when b. the pressure is raised and the temperature is lowered.
The ideal gas refers to a hypothetical fueloline composed of molecules which comply with some rules: Ideal fueloline molecules do now no longer appeal to or repel every different. The handiest interplay among perfect fueloline molecules could be an elastic collision upon effect with every different or an elastic collision with the partitions of the container. When strain is excessive and temperature is low the molecules come nearer and deviation from ideal behaviour is observed.
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For the guided inquiry activity, did your choice of mobile phase work out as expected?
Yes, my choice of mobile phase worked out as expected for the guided inquiry activity.
In a guided inquiry activity, the objective is to explore a scientific phenomenon or concept by conducting an experiment or investigation. In this case, the experiment involved choosing a suitable mobile phase for separating a mixture of dyes using paper chromatography. Based on my understanding of the polarity of dyes and solvents, I chose isopropyl alcohol as the mobile phase. The results showed that the isopropyl alcohol mobile phase was indeed effective in separating the dyes. This confirms that my choice of mobile phase worked out as expected for the guided inquiry activity.
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Which property determines the direction molecules will move through a gel?.
The physical property that determines how DNA moves through a gel is its size or length. DNA molecules are negatively charged due to the phosphate groups in their structure.
In gel electrophoresis, an electric field is applied to the gel, and the negatively charged DNA molecules are attracted towards the positive electrode. However, the movement of DNA through the gel is hindered by the gel matrix. Smaller DNA molecules can move more easily through the pores of the gel, while larger DNA molecules experience more resistance and move slower.
As a result, DNA molecules of different sizes separate and migrate at different rates, with smaller fragments traveling faster and longer fragments traveling slower. This size-dependent movement is a key factor in DNA separation and analysis in gel electrophoresis.
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Complete question :
What physical property determines how the DNA moves the gel?
Which part of this weak acid titration, would it be appropriate to predict/calculate the ph using an ice table and kb?.
It would be appropriate to predict/calculate the pH using an ICE table and Kb during the equilibrium stage of the weak acid titration.
This is when the acid and base are reacting to form the conjugate acid and conjugate base, which will determine the pH of the solution.
During the equilibrium stage of the titration, the weak acid is reacting with the strong base to form the conjugate base. The Kb of the conjugate base can be used to determine the concentration of hydroxide ions, which can then be used to calculate the pH of the solution using the equation pH = 14 - pOH. By using an ICE table, the concentrations of the acid, base, conjugate acid, and conjugate base can be calculated, allowing for the determination of the pH of the solution.
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What is the cardinal rule in handling and using laboratory glassware?
The cardinal rule in handling and using laboratory glassware is to always exercise caution and care. Laboratory glassware is designed to be used in scientific experiments and is made from materials that can withstand high temperatures and chemicals.
When using laboratory glassware, it is essential to ensure that the equipment is clean and free from any contaminants. Glassware should be thoroughly cleaned and sterilized before use to prevent any interference with experimental results. Additionally, it is important to handle the glassware with care and avoid sudden movements that may cause breakage. However, it is important to handle laboratory glassware with care to prevent breakage, which can lead to injuries and damage to the equipment. Another crucial aspect of handling laboratory glassware is to use appropriate personal protective equipment such as gloves and goggles. This will protect you from any potential hazards that may arise during the experiment.
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Calculate the ph of a solution that is 0. 16 m nh3 and 0. 22 m nh4cl kb = 1. 79x10-5
The pH of the solution is 10.81 the solution is 0. 16M of [tex]NH_{3}[/tex] and 0. 22 m [tex]NH_{4} Cl[/tex] and kb is [tex]1. 79*10^{-5}[/tex].
Molarity of [tex]NH_{3}[/tex] = 0. 16 M
Molarity of [tex]NH_{4} Cl[/tex] = 0. 16 M
The pH of the solution can be calculated using the Kb expression for ammonia:
Kb = [[tex]NH_{4+}[/tex]][OH-] / [[tex]NH_{3}[/tex]]
The balanced equation will be:
[tex]NH_{3}[/tex] + [tex]H_{2} O[/tex] ⇌ ( [tex]NH_{4+}[/tex]) + OH-
Substituting the concentrations into the Kb:
[tex]1.79 * 10^{-5} = x^2 / (0.16 - x)[/tex]
x = [tex]6.39 * 10^{-4}[/tex]M
To find the pH of the solution using a negative logarithm
pH = 14 - pOH
pOH = [tex]-log_{[OH-]}[/tex]
pOH= -[tex]log_{6.39 * 10^-{4}}[/tex]
pOH= 3.19
pH = 14 - 3.19
pH = 10.81
Therefore, the pH of the solution is 10.81.
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What is green chemistry in oxidation rxn?(oxidation lab)
By applying green chemistry principles in oxidation reactions, we can promote the development of more sustainable and environmentally friendly chemical processes.
What is green chemistry?Green chemistry is a set of principles and practices aimed at designing chemical processes and products in a way that minimizes the use and generation of hazardous substances and wastes. In the context of oxidation reactions, green chemistry principles can be applied to promote the use of environmentally benign oxidants and reaction conditions, reduce waste generation, and maximize the efficiency of the reaction.
Some examples of green chemistry strategies that can be applied in oxidation reactions include:
1. Using oxygen or air as the oxidant, instead of hazardous chemicals such as chromium(VI) reagents.
2. Using heterogeneous catalysts that can be easily separated and reused, instead of homogeneous catalysts that can generate toxic wastes.
3. Optimizing reaction conditions, such as temperature, pH, and solvent choice, to minimize energy consumption and waste generation.
4. Using renewable feedstocks, such as biomass or waste materials, as the starting materials for the oxidation reaction.
By applying green chemistry principles in oxidation reactions, we can promote the development of more sustainable and environmentally friendly chemical processes.
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which element has the largest bonding atomic radius? which element has the largest bonding atomic radius? niobium technetium yttrium molybdenum zirconium
Among the elements listed - niobium, technetium, yttrium, molybdenum, and zirconium - the element with the largest bonding atomic radius is Yttrium (Y).
Bonding atomic radius typically decreases across a period and increases down a group in the periodic table. In this case, all elements are part of the same period (Period 5), but Yttrium belongs to Group 3, which is further to the left compared to the other elements. Therefore, Yttrium has the largest bonding atomic radius.
Yttrium has the largest bonding atomic radius among the elements niobium, technetium, molybdenum, and zirconium.
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Would it be very accurate to calculate the % yield by using the weight of the reactions added to the beaker before the reaction and the weight after the reaction? Why or why not? (diels adler)
No, doing that would not be accurate because even with a low mass, nothing will disappear.This might be two reactants mixed together, so it might not always yield 100%.
What is the Diels Birch Response?A conjugated diene and an alkene (dienophile) undergo the Diels–Alder reaction to produce unsaturated six-membered rings. Since the response includes the development of a cyclic item through a cyclic change state, it is likewise alluded to as a "cycloaddition".
The Diels-Alder reaction takes place under what conditions?The following is a list of the essential characteristics of the Diels-Alder cycloaddition reaction:
i) A brand-new six-membered ring is always formed by the reaction. Another ring may also be formed when intramolecular.
ii) A s-cis conformation must be possible for the diene component.
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How do we find solubility if we have the solubility constant?
The solubility constant (or equilibrium constant) is a measure of the equilibrium between the solid and the dissolved species of a chemical compound.
What is compound?Compound is a term used in chemistry and physics to describe a combination of two or more elements, atoms, or molecules. Compounds are formed when atoms of different elements bond together chemically, forming a new substance with its own unique properties. Many of the substances found in everyday life are compounds, such as water, salt, sugar, and baking soda.
The solubility constant is a ratio of the concentrations of the dissolved species and the solid species, and it is expressed as a logarithmic value. The solubility constant can be used to calculate the solubility of a compound in a given solution. To do this, first calculate the concentration of the dissolved species in the solution. Then, take the logarithm of the solubility constant and multiply it by the concentration of the dissolved species. The result is the solubility of the compound in the given solution.
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A helium-filled balloon floats in air. What will happen to an air-filled balloon in helium? why?.
When a helium-filled balloon is released, it rises up in the air due to the fact that helium is less dense than air. This is because helium atoms are much lighter than the molecules that make up the air we breathe.
Now, if we were to take an air-filled balloon and place it in a container filled with helium, the opposite effect would occur. Since air is denser than helium, the air-filled balloon would actually sink in the helium. This is because the buoyant force acting on the balloon is not strong enough to counteract the force of gravity pulling it down.
To understand this better, we need to look at the concept of buoyancy. Buoyancy is the upward force exerted by a fluid on an object immersed in it. This force is equal to the weight of the fluid displaced by the object. In the case of the helium-filled balloon, the weight of the displaced air is less than the weight of the helium in the balloon, resulting in a net upward force that allows it to float.
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__________ refers to reactions in which small molecules are combined to build larger molecules.
The main answer to your question is "anabolic reactions".
Anabolic reactions refer to the process by which small molecules are combined to build larger molecules.
This process requires energy and is usually associated with the growth and repair of tissues in organisms.
In contrast, catabolic reactions break down larger molecules into smaller ones and release energy in the process.
Anabolic reactions are the process of combining small molecules to form larger, more complex molecules, playing a crucial role in growth and tissue maintenance.
In summary, anabolic reactions are essential for the synthesis of complex molecules, while catabolic reactions provide energy for cellular activities.
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Helium atoms emit light at several wavelengths. Light from a helium lamp illuminates a diffraction grating and is observed on a screen 50. 00 cm behind the grating. The emission at wavelength 501. 5 nm creates a first-order bright fringe 21. 90 cm from the central maximum.
The spacing between the grating lines is 2.87 × 10⁻⁶ cm.
The distance between the grating and the screen is given as 50.00 cm. The emission at a wavelength of 501.5 nm creates a first-order bright fringe 21.90 cm from the central maximum.
We can use the equation for the diffraction grating to calculate the spacing between the grating lines:
d sin θ = mλ
Since the problem involves the first-order bright fringe, we can set m = 1:
d sin θ = λ
Rearranging the equation:
d = λ / sin θ
Substituting the given values for λ and θ, we get:
d = (501.5 nm) / sin(arctan(21.90 cm / 50.00 cm)) = 2.87 × 10⁻⁶ cm
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"When 0.0500mol of HCl(aq) reacts with 0.0500 mol of NaOH(aq) to form 0.0500 mol of NaCl(aq), 2.9kJ of heat are produced. What isΔH, the enthalpy change, per mole of acid reacting, for the acid-base reaction run under the conditions described in the following:
HCl(aq)+NaOH(aq) ⟶ NaCl(aq)+H2O(l"
−58kJ is the enthalpy change, per mole of acid reacting, for the acid-base reaction run under the conditions described in the following
Define standard enthalpy of reaction
The difference between total reactant and total product molar enthalpies, computed for substances in their standard states, is the standard enthalpy of reaction for a chemical reaction.
The amount of heat in a system is its enthalpy. The quantity of energy lost or gained during a reaction is generally similar to the enthalpy change of the process. If the system's enthalpy drops relative to the reaction, the reaction is preferred.
The amount of thermal energy per unit of temperature in a system that cannot be used for productive work is known as entropy. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.
HCl(aq)+NaOH(aq) ⟶ NaCl(aq)+H2O(l)
ΔH=1mol HCl×−2.9kJ/0.0500mol HCl=−58kJ
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What is the first element with an atomic mass over 100.
The first element with an atomic mass greater than 100 is Ruthenium (Ru), with an atomic number of 44 and an atomic mass of 101.07 u.
Atomic mass is the average mass of the atoms of an element, and it is measured in atomic mass units (AMU).
To calculate the mass of an atom, we add the number of protons and neutrons in the nucleus. Technetium (Tc) is the element with an atomic mass nearest to 100, with an atomic number of 43 and an atomic mass of 98 u. The elements in the periodic table are arranged in order of their atomic numbers, and Ruthenium follows Technetium in this sequence.
Therefore, Ruthenium is the first element in the periodic table to have an atomic mass greater than 100.
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Use the periodic table to predict the most stable oxidation state for the following element: Br
Using the periodic table to predict the most stable oxidation state for the Br atom is -1.
Option E is correct.
Electronic configuration of Bromine (Br) =
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵
We are aware that the noble gas configuration (ns²np⁶) is the electronic configuration that is the most stable. Due to the fact that Br has a valence shell that lacks one electron, it must add one more than the noble gas configuration.
This means, the most stable oxidation state of Br is -1
What are the four different configurations of electrons?The four distinct sorts of orbitals (s,p,d, and f) have various shapes, and one orbital can hold a limit of two electrons. The p, d, and f orbitals have different sublevels, subsequently can hold more electrons. As expressed, the electron setup of every component is one of a kind to its situation on the occasional table.
Electronic configuration:The electron design of a component depicts how electrons are dispersed in its nuclear orbitals. Atomic electron configurations follow a standard notation in which all electron-containing atomic subshells are arranged in a particular order, with the number of electrons they hold written in superscript.
Incomplete question:
Use the periodic table to predict the most stable oxidation state for the following element Br
A. 0
B. +1
C. +2
D. +3
E. -1
F. -2
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Without doing a calculation, arrange the following group of molecules in order of decreasing standard molar entropy (s): х hexane (C6H12), benzene (CH), cyclohexane (CH12) O CH4> CH> CH2 OCH >CH12 > CH4 O CH2 > C6H4>CH OCH4> CH12 > CH CH2 CH > CH4 OCH > CH4> CH2 0 Without doing a calculation, arrange the group in order of decreasing standard molar entropy (s'):
The correct decreasing order of standard molar entropy is
Hexane(C₆H₁₄) > Cyclohexane(C₆H₁₂) > Benzene(C₆H₆)
As benzene has three double bond it is most rigid so it has least entropy. Similarly due to cyclic structure cyclohexane has less entropy than hexane. The standard molar entropy of a substance is absolutely the entropy of one mole of the substance withinside the standard state. For any chemical reaction, the usual entropy alternate is the sum of the usual molar entropies of the goods minus the sum of the usual molar entropies of the reactants.
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How do you know which solvent is best for separation in TLC? (oxidation lab)
The most crucial part of TLC is probably choosing the right solvent, and finding the optimal one could involve some trial and error.
What factors affect the TLC solvent selection?
The nature of the constituent to be separated, specifically whether it is polar or non-polar, and the nature of the process involved, specifically whether it is an instance of "adsorption" or "partition chromatography," are the only two significant factors that influence the choice of solvent or a mixture of solvents used in TLC.
A chemical travels up the TLC plate more slowly the more tightly it is bonded to the adsorbent. Polar substances move up the TLC plate more slowly while non-polar compounds move up the plate more quickly (higher Rf value).
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if 10 ml of ethyl acetate was contaminated with 0.1 g of tetrabutylammonium bromide. what effect would this contamination have on the bp of ethyl acetate? briefly explain
Contamination of 10 ml of ethyl acetate with 0.1 g of tetrabutylammonium bromide is likely to result in a slight increase in the boiling point of ethyl acetate.
Tetrabutylammonium bromide is an ionic compound that is highly soluble in polar solvents such as water and ethanol. It is not very soluble in nonpolar solvents such as ethyl acetate, but even a small amount of contamination can have an effect on the boiling point of the solvent. The addition of a non-volatile solute such as tetrabutylammonium bromide to a solvent such as ethyl acetate results in an increase in the boiling point of the solution. This is because the presence of the solute reduces the vapor pressure of the solvent, which means that more energy is required to boil the solution and reach its boiling point.
The magnitude of the effect on the boiling point of the solvent depends on the concentration of the solute and the identity of the solvent. In this case, the amount of contamination is small, so the increase in boiling point is expected to be minor. However, if the contamination were more significant, it could have a more substantial effect on the boiling point of ethyl acetate.
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What is the pH of 1.00 g of propionic acid and 1.0 g of sodium propionate in 500 mL of solution? (A) 3.78. (B) 4.77. (C) 4.89. (D) 5.01. (E) 5.13. (F) 5. 25. (G) 5.37.
To determine the pH of the solution, we need to first calculate the concentration of propionic acid and sodium propionate in the solution.
Propionic acid has a molar mass of 74.08 g/mol, so 1.00 g is equal to 0.0135 mol.
Sodium propionate has a molar mass of 96.06 g/mol, so 1.0 g is equal to 0.0104 mol.
We can assume that all of the propionic acid will dissociate in water to form propanoate ions and hydrogen ions, according to the following equation:
CH3CH2COOH + H2O ↔ CH3CH2COO- + H3O+
The equilibrium constant for this reaction is Ka = 1.3 x 10^-5.
We can set up an ICE table to determine the concentration of propanoate and hydrogen ions:
Initial: 0.0135 M 0 0
Change: -x +x +x
Equilibrium: 0.0135 - x x x
Using the Ka expression, we can write:
Ka = [CH3CH2COO-][H3O+] / [CH3CH2COOH]
1.3 x 10^-5 = x^2 / (0.0135 - x)
Since x is small compared to 0.0135, we can simplify this to:
1.3 x 10^-5 = x^2 / 0.0135
Solving for x, we get:
x = 2.07 x 10^-4 M
Therefore, [H3O+] = 2.07 x 10^-4 M and [CH3CH2COO-] = 2.07 x 10^-4 M.
Now, we can calculate the concentration of sodium propionate by dividing the moles by the volume of the solution:
0.0104 mol / 0.5 L = 0.0208 M
Since sodium propionate completely dissociates in water to form propanoate ions and sodium ions, the concentration of propanoate ions is equal to the concentration of sodium propionate:
[CH3CH2COO-] = 0.0208 M
To calculate the pH, we can use the equation:
pH = -log[H3O+]
pH = -log(2.07 x 10^-4) = 3.68
Therefore, the pH of the solution is approximately 3.68.
The closest answer choice is (A) 3.78, so that would be the best choice.
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