The nitrogen atoms have a hybridization of sp3, due to the three covalent bonds and the lone pair that was added in part a.
What is hybridization?Hybridization is the process of combining two or more different varieties, species, or breeds of plants or animals to produce offspring with characteristics from each of the parent organisms. Through hybridization, animals can be selectively bred to produce desired traits, while plants can be bred to produce higher yields and resist diseases.
Caffeine has a molecular formula of C8H10N4O2. The structure of caffeine is as follows:
O
//\\
N=C-N-C=C-N-C-N
|
O
The oxygen atoms have a hybridization of sp3, due to their four electron pairs (three covalent bonds and one lone pair).
The nitrogen atoms have a hybridization of sp3, due to the three covalent bonds and the lone pair that was added in part a.
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Part A
Enter the Ksp expression for A2B3(s) in terms of [A] and [B].
Part B
Enter the Ksp expression for AC4(s) in terms of [A] and [C].
Express your answer in terms of [A] and [C], for example, [X]*[Y]^2.
The Ksp expression for A2B3(s) in terms of [A] and [B] is Ksp, the Ksp Equation for the specified solid is Ksp = 4x3.
How is KSP determined?Ksp = [a] [b]2, where Ksp is the maximum amount of solute that can dissolve at equilibrium. If you make x=a, you know that b=2x because there is twice as much b as a. Molar solubility is merely another word for molarity. These values for both a and b in respect of x allow you to calculate Ksp as [x] [2x]2, which equals Ksp=4x3.
∠K=∠K [Common]
∴ △KNP∼△KML [By AA-criterion of similarity]⇒ KMKN =
ML
NP
[∵ Corresponding sides of similar triangles are proportional] ⇒ b+cc= ax⇒x= b+cac
KSP=[x] [2x]2:
What does it mean?You may make Ksp equal to [x] [2x]2 with all those values a and conversely in terms of x, which implies that Ksp equals [x] [4x]3.
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you have one mole of each of these atoms: carbon-12, oxygen-16, and uranium-235. Which substance has more atoms
One mole of each element contains Avogadro's number of atoms, which is 6.022 x 10^23 atoms. Therefore, all three substances have the same number of atoms, which is 6.022 x 10^23 atoms.
a 40 mg sample of phosporus reacts with 77.6 mg sample of selinum to for the cpmpound phosphourous selenide. what is the emperical formula of phosphurus
Phosphorus interacts with selenium to generate 77.6 mg of the compound from a sample of 40 mg of phosphorus. Therefore, phosphorus selenide has an empirical formula is P₃Se₁.
A compound's empirical formula is a formula that displays the ratio of the elements contained in the compound but not the precise number of atoms present in the molecule.
The molar mass of phosphorus (P) is 31 g/mol and selenium (Se) is 79 g/mol. Then, computing the moles of phosphorus, we get,
[tex]\begin{aligned}\text{moles of P}&=\mathrm{0.04\;g}\times\mathrm{\frac{1\;mole}{31\;g}}\\&=\mathrm{1.29\times10^{-3}\;moles}\end{aligned}[/tex]
The total mass is 77.6 mg. Then, the mass of selenium is (77.6-40)mg=37.6 mg=0.0376 g. Computing the moles of selenium, we get,
[tex]\begin{aligned}\text{moles of Se}&=\mathrm{0.0376\;g}\times\mathrm{\frac{1\;mole}{79\;g}}\\&=\mathrm{0.476\times10^{-3}\;moles}\end{aligned}[/tex]
Now, divide the mole value of smaller by the mole value of P and Se. We get,
[tex]\begin{aligned}\frac{1.29\times10^{-3}}{0.476\times10^{-3}}}&=2.71=3\\\frac{{0.476\times10^{-3}}}{{0.476\times10^{-3}}}&=1\end{aligned}[/tex]
Therefore, the required answer is P₃Se₁.
The complete question is -
A 40 mg sample of phosphorus reacts with selenium to form 77.6 mg of the compound. What is the empirical formula of phosphorus selenide?
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what is going on in the mantle and it’s connection to the feature on the surface ?
The motion of material is what is going on in Earth's mantle, powered by heat from the deep interior, moves tectonic plates on our planet's surface and this motion generates earthquakes, fuels volcanic activity, and shapes surface landscapes.
What is a Mantle?This is referred to as a layer inside a planetary body bounded below by a core and above by a crust and it is usually made up of rocks or ice which undergoes various forms of motion.
The motion which goes on in the mantle is as a result of the force which is generated from the heat in the deep interior which moves tectonic plates on our planet's surface as depicted in the diagram given.
The result is the formation of earthquakes, fuels volcanic activity, and and it also shapes the surface landscapes thereby making it the reason why it was chosen as the correct choice.
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Which compound exhibits the strongest overall intermolecular forces
Answer: The correct answer is Option A. Compound Y will have the highest boiling point.
Intermolecular forces are the forces that hold the molecules of compounds together. The more the strength of these forces is more will be the force of attraction between them. Hence a compound having stronger intermolecular forces will be hard to break or boil.
So a compound having strong intermolecular force will have a high boiling point as it takes more energy to break apart these molecules.
In the given question compound Y has highest boiling point so it has the maximum intermolecular force between its atoms or molecules.
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state the colour universal indicator would turn in the oven cleaner.
We know that oven cleaners are basic in nature ranging pH from 11-13 and hence can change the universal indicator Blue or purple.
What is Universal indicator?An indication that may be used to determine whether a solution is acidic or basic is known as a universal indicator.It is a pH indicator made of a solution of several chemicals that displays multiple smooth colour changes over a broad pH range.While there are a number of universal pH indicators that are commercially available, Yamada's patented formula is used in the majority of them.Chemical Abstracts has information on this patent available. In the Journal of Chemical Education, experiments with Yamada's universal indicator are also covered.A universal indicator often contains the following ingredients: water, 1-propanol, phenolphthalein, sodium hydroxide, methyl red, bromothymol blue, sodium bisulfite, and thymol blue.An basic solution is one that is coloured blue or violet, while an acidic solution is one that is coloured yellow to red A solution that is coloured green .To learn more about universal indicator from the given link
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Under standard conditions of 298 K and 1 atm, which statement is true?a. diamond converts to graphite spontaneouslyb. graphite converts to diamond spontaneouslyc. none of the above
Under a standard conditions diamond converts to graphite spontaneously.
The constant of thermodynamic equilibrium K is the correct quotient of species activities in a reaction equilibrium. An activity cannot be many orders of magnitude greater than 1 at ordinary temperature as well as pressure.
Thermodynamic properties are termed as system characteristics that can specify the system's state. Some constants, such as R, do not explain the state of a system and so they are not attributes. Transformation of diamond to graphite is spontaneous as well as advantageous, according to thermodynamics. However, because of kinetics rather than thermodynamics governs this reaction, it proceeds at an exceedingly slow rate. Diamond will be kinetically stable but thermodynamically unstable.
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through stoichiometric calculations, the theoretical yield of iron(iii) oxide was calculated to be 12.3 g. however, when massed after the reaction, only 10.7 g of iron(iii) oxide had been produced. what is the percent yield of iron(iii) oxide?
The amount that would be produced by the reaction if it were complete is known as the theoretical yield. yield in percentage: 0.15 / 0.16 x 100 = 93.75%
In eleventh-grade chemistry, what is a reaction?Chemical Response: Chemical reactions are the processes by which a substance or substances change chemically to create a new substance or substances with entirely new attributes. Products are completely distinct in nature and identity from reactants.
What category does the reaction fall under?Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.
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the kw for water at 0 °c is 0.12× 10–14. calculate the ph of a neutral aqueous solution at 0 °c.
The pH of a neutral aqueous solution at 0 °c will be 7.46.
In case of H2O, the concentration of hydronium ions, or H⁺, will be equal to the concentration of the hydroxide ions i.e [H⁺] = [OH⁻].
Remember, Kw = [H⁺][OH⁻] for water and if [H⁺] and [OH⁻] are both equal, we can easily solve by taking the square root of Kw.
[H⁺] = sqrt(0.12*10^-14) = 3.46*10^-8
(2 sig figs. Keep some extra so there will be not a rounding error.)
and remember that pH = -log[H⁺] = -log(3.46*10^-8) = 7.46
(The rules for sig figs are that if you take the log of a number with x significant figures, then the result will have x significant decimal places.)
The pH of water is 7.46
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the rate of effusion of a particular gas was measured and found to be 29.0 ml/min. under the same conditions, the rate of effusion of pure methane () gas is 47.8 ml/min. what is the molar mass of the unknown gas?
The molar mass of the unknown gas is 17.64 g/mol.
What is molar mass?Molar mass is a measure of the mass of a given chemical compound, which is calculated by dividing the mass of the substance in grams by its amount in moles.
The molar mass of the unknown gas can be calculated using Graham's law of effusion, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. The equation can be written as follows:
rate of effusion of unknown gas = (rate of effusion of methane) x (sqrt(molar mass of unknown gas))/sqrt(molar mass of methane)
Substituting the given values, we get:
29.0 ml/min = (47.8 ml/min) x (sqrt(molar mass of unknown gas))/sqrt(16.04 g/mol)
Solving for the molar mass of the unknown gas, we get:
molar mass of unknown gas = (16.04 g/mol) x (29.0 ml/min)^2 / (47.8 ml/min)^2
molar mass of unknown gas = 17.64 g/mol
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in a hydrogen atom which transition would emit the longest wavelength light? select all that apply 1. n
The wavelength will be longer the higher the magnitude of the fundamental quantum number to which the electron is hopping. Thus, the longest wavelength is produced by the n = 6 to p = 8 transition.
How would one describe wavelengths?The length of a wave is expressed by its wavelength. The wavelength is the distance between one wave's crest and the following wave's crest. The wavelength can also be determined by measuring from the "trough" (bottom) of one wave to the "trough" of the following wave.
Why is wavelength significant and what is it?The distance that a wave repeats is measured by its wavelength. The letter lambda () stands for these recurrences, also known as wavelengths. Energy travels through a medium as waves (like the atmosphere, the vacuum, or even the ocean).
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Donald is writing a chemical name from a chemical formula. He has just identified that there are five atoms of oxygen bonded with two atoms of phosphorus.
What is the chemical name of Donald's compound?
Phosphorus pentoxide is the chemical name for a molecule in which five oxygen atoms are bound to two phosphorus atoms (P2O5).
What is the purpose of phosphorus pentoxide?A potent drying & dehydrating agent is phosphorus pentoxide. P2O5 can be used in a wide range of processes, including the dehydrating of amides to nitriles, which requires for the elimination of a water molecule.
Why is P2O5 a component of fertiliser?Triple super phosphate is the name given to the concentrated superphosphate, which contains 46% P2O5. It is possible to use this fertiliser on any soil and with any crop. It should be used along with organic manure on acidic soils. It may be used prior to, during, or after transplantation.
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the empirical formula of a compound is no2. its molecular mass is 92 g / mol. what is its molecular formula.
The substance, whose empirical formula is NO2 and whose molecular mass is 92 g/mol, has the molecular formula N2O4 (dinitrogen tetroxide).
What exactly are empirical formulas?Empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of the atoms. This would be the compound's element with the smallest whole number ratio.
molecular formula = empirical formula × n
where "n" is the total number of components required to construct a molecular formula.
molar mass of your compound is 92 g/mol (Given)
It implies that molar mass of every atom in that molecule must equal 92 g/mol.
1×14.0067 g/mol + 2×15.9994 g/mol = 46.0055 g/mol
So, if one building block has a molar mass of 46.0055 g/mol, how many would you need to get the molecule?
46.0055 g/mol × n = 92 g/mol
n = 92g/mol / 46.0055 g/mol = 1.99976 ≈ 2
As a result, the substance's molecular formula, which includes a list of each atom that constitutes a molecule, will be
(NO2) × 2 = N2O4 (dinitrogen tetroxide)
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16h2 +88h+121.
Factor
The expression can be factored as (4h + 11)(4h + 11).
What exactly is an expression?
In chemistry, an expression is a basically statement or equation that describes the relationship between different chemical quantities. It usually involves mathematical operations and chemical symbols that represent elements and compounds. Expressions are used to describe chemical reactions, predict their outcomes, and develop new theories and models of chemical behavior.
This is because 4h + 11 can be written as (2h + 5)(2h + 5) and since 4h + 11 appears twice in the expression, we can factor it out of the entire expression.
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The work of expanding a gas. Compute the total work performed when expanding an ideal gas, at constant temperature, from volume V to 2V.
The total work performed is nRT * 0.693
The work done by an ideal gas during an expansion at a constant temperature from volume V to 2V can be calculated using the equation work = nRT * ln(Vf/Vi).
Where n is the number of moles of gas, R is the ideal gas constant, T is the temperature, Vf is the final volume and Vi is the initial volume.
In this case, the initial volume is V and the final volume is 2V, so
the work done is nRT * ln(2V/V).
Since ln(2) is equal to 0.693, the work done is nRT * 0.693. Keep in mind, this equation is only true for certain types of gas at specific temperatures and pressures.
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If the actual yield of sodium chloride from the reaction of
8.3g of sodium and 4.5g of chlorine is 6.4g, what is the percent yield?
2na(s) + cl2(g)-->2nacl(s)
a. 170%
b. 120%
c. 30%
d. 86%
If the reaction between 8.3g of sodium & 4.5g of chlorine produces an actual yield for sodium chloride of 6.4g, so the percent yield becomes 86%.
Sodium chloride: What is it?The ionic compound salt, also known as sodium chloride, has the chemical formula NaCl. Sodium chloride is utilized as electrolytes replenisher to help lessen heat cramps caused over by excessive sweating. This drug is also used to make a standard isotonic sodium chloride solution. It's used as a preservative as well as a spice for enhance flavor. In addition, sodium chloride is used to make polymers and other products.
By using the formulae -
Actual yield divided by theoretical yield multiplied by 100 to get percent yield.
percent yield = 6.4 / 7.4 × 100
percent yield = 86%
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Part A Determine The [OH-] Of A Solution That Is 0.180 Min F-. Ka For HF Is 6.8 X 10-4. Express Your Answer Using Two Significant Figures.
[OH^-] = ................ M
The [OH-] Of A 0.180 min F- Solution. Ka For HF Is 6.8 X 10-4. E.
[OH^-] = 0.004 Moles
To determine the [OH-] of a solution, we can use the relationship between the acid dissociation constant (Ka) and the base dissociation constant (Kb).
The relationship is: Kb x Ka = Kw
Where Kw is the ion product constant of water which is 1.0 x 10^-14 at 25°C.
We know that the Ka of HF is 6.8 x 10^-4. To find the Kb of F-, we'll use the above terms.
Kb x 6.8 x 10^-4 = 1.0 x 10^-14
Kb = 1.0 x 10^-14 / 6.8 x 10^-4
Kb = 1.47 x 10^-11
To find the [OH-] of the solution, we'll use theformulae:
[OH-] = sqrt(Kb)
[OH-] = sqrt(1.47 x 10^-11)
[OH-] = 0.0038
So the [OH-] of the solution is 0.0038 M
However, the question requires to express the answer using two significant figures. So, the [OH-] of the solution is 0.004 M
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Label each reactant and product in this reaction as a Bronsted acid or base.
HCN + NH2- >><< CN- + NH3
This indicates that it is a proton acceptor, which qualifies it as a Bronsted base.
What is Bronsted base?Any species that can accept a proton and needs one pair of electrons to bond to the H+start text, H, end text, start superscript, plus, end superscript is referred to as a Brnsted-Lowry base. Since water is amphoteric, it can function as both a Brnsted-Lowry acid and a base. A Bronsted-Lowry base is a compound that can accept a hydrogen ion, whereas a Bronsted-Lowry acid can donate one. A Lewis base is a substance that can give up two electrons, whereas a Lewis acid can take in two electrons.
Here,
It qualifies as a Bronsted base because this suggests that it is a proton acceptor.
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What is the key difference between test and negative control groups in an experiment?
The key difference between test and negative control groups in an experiment is that Control groups check the mean effectiveness of an intervention whereas test use the technique of matching.
Assigning people on the basis of chance ensures that both known and unknown invalidating factors are cancelled out, and that this occurs automatically rather than being dependent on individual judgment and trustworthiness. In behavioral and social (as well clinical) research, the ideal scientific experiment is a so-called randomized controlled trial, briefly an RCT.
Members of control groups are not supposed to develop group cohesion because that would entail a contaminating factor in the experiment. Researchers are interested in the average response of individual members rather than in their behavior as a group (see Clinical Trials and Intervention Studies).
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what is the molarity of 2500 ml of a solution that contains 160 grams of ammonium nitrate (nh4no3)? group of answer choices 0.600m 0.800m 0.333m 0.450m
The molarity of 2500 ml of a solution that contains 160 grams of ammonium nitrate (nh4no3) is 0.600M.
What is molarity?Molarity is a measure of the concentration of a solution. The concentration of a solution can be determined by measuring the mass of the solute and the volume of the solution. Molarity is a useful measure when trying to understand how much of a solute is present in a given volume of solution. It can be used to compare the strength of different solutions, and also to calculate how much solute is required for a given volume. Molarity is an important concept in chemistry and is used in many areas of science.
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Which of the following occurs first in synaptic transmission once the action potential reaches the end bulbs
Once an action potential reaches the end bulbs of a neuron, the first event in synaptic transmission is the release of neurotransmitters from the presynaptic neuron.
When an action potential reaches the end bulbs, it causes the opening of voltage-gated calcium channels in the presynaptic membrane. This influx of calcium ions into the presynaptic neuron triggers the release of neurotransmitters stored in vesicles at the synapse.
The neurotransmitters then diffuse across the synaptic cleft, the small space between the presynaptic and postsynaptic neurons, and bind to receptors on the postsynaptic membrane. This binding causes a change in the electrical or chemical properties of the postsynaptic neuron, leading to the initiation or inhibition of an action potential in the postsynaptic neuron.
It's worth noting that, this process is called synaptic transmission, it's the process by which an action potential in one neuron causes an electrical or chemical signal in another neuron, muscle cell or gland cell.
a sample of h2 gas is collected over water. the pressure in the gas collection tube is 1.03 atm. the vapor pressure of the water is 0.06 atm. what pressure does the hydrogen gas exert?
H₂ gas is collected over water in a sample. The pressure exerted by this gas is 0.97 atm.
Water displacement can be used to gather a gas created during a chemical reaction. As a result of being collected above water, the gas isn't really pure because it has been mixed with water vapor via evaporation. Dalton's law can be used to calculate how much of the desired gas is present after taking the contribution of the water vapor into account.
Then, the total pressure is given by [tex]\mathrm{P_{total}=P_{dry\;gas}+P_{water\;vapor}}[/tex]. Then, the total pressure for the given situation is written as [tex]\mathrm{P_{total}=P_{H_2}+P_{H_2O}}[/tex]. Using this formula, the pressure exerted by the hydrogen is calculated as follows,
[tex]\begin{aligned}\mathrm{P_{H_2}}&=\mathrm{P_{total}-P_{H_2O}}\\&=\mathrm{1.03\;atm-0.06\;atm}\\&=\mathrm{0.97\;atm}\end{aligned}[/tex]
The required answer is 0.97 atm.
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Draw Lewis structures for the N-methylidenehydroxylamine molecule (CH2NOH), the methylamine molecule (CH3NH2), and the acetonitrile molecule (CH3CN) in the window below, and then answer the questions that follow, based on your drawings.Draw one structure per sketcher box. Separate added sketchers with + signs from the dropdown menu.b.) What is the bond order of the carbon- nitrogen bond in the N-methylidenehydroxylamine molecule? (enter a number)c.)Which species has the longest carbon-nitrogen bond, CH2NOH, CH3NH2, or CH3CN?methylamineacetonitrileN-methylidenehydroxylamined.) Which species has the weakest carbon - nitrogen bond, CH2NOH , CH3NH2, or CH3CN ?methylamineacetonitrileN-methylidenehydroxylamineShow Approach
The carbon-nitrogen link in the N-methylidene hydroxylamine molecule has a bond order of 2.
What is a molecule, for instance?A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical properties. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.
What makes something a molecule?Its original definition, "the smallest unit of a substance that yet preserves the qualities of that substance," was intended to be encompassed by this designation. "An atom is a body that cannot be cut in two; a molecule is the smallest conceivable component of a specific substance," wrote James Maxwell in 1873 when defining atom and molecule.
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a solution was prepared by dissolving 105.0 g of kcl in 215 g of water. what is the molality (in m) of kcl in this solution?
Considering the definition of molality, the molality of the KCl in the solution is 6.56 moles/kg.
Molality, or molal concentration, is the amount of a substance dissolved in a given mass of solvent. It is defined as the moles of a solute per kilogram of solvent.
The Molality of a solution is determined by the expression:
molality= number of moles of solute÷ kilograms of solvent
Molality in this case
In this case, you know:
mass of KCl= 105 g
mass molar of KCl= 74.55 g/mole
number of moles of solute= mass of KCl÷ mass molar of KCl= 105 g÷ 74.55 g/mole= 1.41 moles
Mass of solvent = 215 g of water= 0.215 kg (being 1000 g=1 kg)
Replacing in the definition of molality:
Molality= 1.41 moles÷ 0.215 kg
Molality= 6.56 moles/kg
The molality of the solution is 6.56 moles/kg.
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the valve between a 3.00-l tank containing o2(g) at 7.36 atm and a 2.10-l tank containing ne(g) at 5.08 atm is opened. calculate the ratio of partial pressures (o2:ne) in the container.
The ratio of partial pressures (o2:ne) in the container is 2.07.
The pressure that is exerted by one among the mixture of gases if it occupies the same volume on its own is known as Partial pressure. Every gas exerts certain pressure in a mixture. The total pressure of a mixture of an ideal gas is the sum of partial pressures of individual gases in the mixture, based on the following equation:
[tex]V_{x}[/tex] denotes the partial pressure of the particular gas.
[tex]P_{x}[/tex] indicates the partial pressure of the gas x.
[tex]V_{tot}[/tex] denotes the total volume of the mixture.
Nx indicates the amount of gaseous substance.
[tex]P_{tot}[/tex]denotes the total pressure of the mixture.
[tex]N_{tot}[/tex] is the total amount of substance in a mixture.
Given that,
[tex]$$P_0=7.36 \text { with, } v_0=36 . \quad T=298 k$$[/tex]
we know that,
[tex]$$\begin{aligned}P_{O_2} v_3=n_0 & \{T \\\text { m } \quad n_{2_2} & =\frac{P_0 \times V_{\mathrm{O}_2}}{R T}=\left(\frac{7.362 m \times 34}{0.082 \times 298}\right) \\n_{\mathrm{B}_2} & =0.90_3 \mathrm{~m} 1\end{aligned}$$[/tex]
Now,
[tex]$$\begin{aligned}& P_{\text {Ne }}=5.08 \mathrm{~atm} \quad V_{\text {Ne }}=2.10 \mathrm{~L} \\& n_{\text {re }}=\frac{P_{\text {re }} \times V_{\text {Ne }}}{R T} \\& n_{\text {re }}=\frac{(5.08 \times 2.10)}{(0.182 \times 298)}=0.436\end{aligned}$$[/tex]
Now,
in container pressure of [tex]$O_2=P_{0_2}({mix})$[/tex]
in container pressure of Ne [tex]=P_{Ne}({mix})$[/tex]
[tex]& P_2({mix})=x_{0_2} \times P_{\text {total }} . \quad \quad P_{\text {total }}=f_2+P_{\text {are }} \\&\end{aligned}[/tex]
[tex]P_{0_2}({mix})$[/tex] = [tex](\frac{0.903}{0.90308})[/tex]×[tex]12.44[/tex] = [tex]( 7.36+5.08)[/tex]
[tex]P_{0_2}({mix})$[/tex] = [tex]8.38[/tex]atm [tex]Patom[/tex] [tex]=12.44[/tex] atm
[tex]$$\begin{aligned}& P_{\text {Ne (mix)}}=x_{\text {ne }} \times P_{\text {total }} \\& =\frac{0.436}{(0.90870 .436)} \times 12.44 \\& P_{\text {Ne(mix) }}=4.03 \text { atm } \\&\end{aligned}$$[/tex]
Now,
[tex]$\begin{aligned} \frac{P_{0_2 \text { (mixther) }}}{P_{\text {Ne (Mistare) }}} & =\left(\frac{8.38}{4.03}\right) \\ & =2.07\end{aligned}$[/tex]
Therefore, the ratio of partial pressures (o2:ne) in the container is 2.07.
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a student uses 0.343 g of an unknown sulfate salt for her gravimetric analysis experiment. after completing her experiment, she obtains 0.563 g of a white precipitate. what is the percent composition of sulfate in her unknown sulfate salt?
The answer is that the percent composition of sulfate in the unknown sulfate salt is 100%. This indicates that all of the salt was sulfate, and that the white precipitate was composed entirely of sulfate.
What is percent composition?Percent composition is a concept in chemistry that refers to the relative proportions of the elements that make up a chemical compound, expressed as a percentage by mass.
The percent composition of sulfate in the unknown salt can be calculated using the following equation:
(Mass of precipitate/Mass of unknown sulfate salt)*100 = % composition of sulfate
In this case, the calculation is:
(0.563 g/0.343 g)*100 = 164.4%
Since it is not possible for something to have more than 100% composition, the answer is that the percent composition of sulfate in the unknown sulfate salt is 100%. This indicates that all of the salt was sulfate, and that the white precipitate was composed entirely of sulfate.
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It takes 18.48 mL of a 1.66 M phosphoric acid solution to neutralize 298.70 mL of lithium hydroxide solution. What is the concentration of the lithium hydroxide solution?
The concentration of the lithium hydroxide solution is 0.034 M.
What is the solution about?To find the concentration of the lithium hydroxide solution, we can use the balanced equation for the neutralization reaction between phosphoric acid and lithium hydroxide:
H₃PO₄ + 3LiOH -> Li₃PO₄ + 3H₂O
We can also use the stoichiometry of the reaction to determine the number of moles of lithium hydroxide that were neutralized by the phosphoric acid. Since the ratio of moles of acid to moles of base is 1:3, we can use the following formula:
C(LiOH) = (moles of LiOH) / (volume of LiOH in liters)
To find the moles of LiOH, we can use the volume and concentration of the phosphoric acid:
moles of H₃PO₄
= (18.48 mL) * (1.66 M)
= 30.6248 moles
moles of LiOH
= (30.6248 moles) * (1 mol LiOH / 3 mol H₃PO₄)
= 10.2083 moles
To find the concentration of the lithium hydroxide solution, we can divide the moles of LiOH by the volume of LiOH:
C(LiOH) = (10.2083 moles) / (298.70 mL * 0.001 L/mL) = 0.034 M
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A student attaches a glass bulb containing neon gas to an open-tube manometer (like the one in Fig. 3A.5) and calculates the pressure of the gas to be 0.890 atm. (a) If the atmospheric pressure is 762 Torr, what height difference between the two sides of the mercury in the manometer did the student find
The difference between the two is the height of the mercury in the manometer (0.170 atm).
What is mercury?Mercury has the chemical symbol Hg and the atomic number 80. It was formerly known as hydrargyrum, derived from the Greek phrase hydor (water) as well as argyros (silver) (silver). Mercury is the one metallic element known to just be liquid at normal temperatures and pressures; the only other element known to be liquid under such conditions is indeed the halogen bromine, tho metals including caesium, gallium, but also rubidium melt a little above room temperature.
The height difference between the two sides of the mercury in the manometer that the student found was 0.890 atm - 762 Torr = 0.170 atm. This is because the pressure of the gas in the bulb (0.890 atm) is higher than the atmospheric pressure (762 Torr).
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An organic synthesis to make the pain reliever acetominophen is supposed to produce 280 kg of product but instead produces 70 kg of waste in addition to the acetaminophen. what is the percent yield?
To calculate the percent yield, we need to divide the actual yield (the amount of product produced) by the theoretical yield (the amount of product that should be produced based on the stoichiometry of the reaction) and multiply by 100.
Actual yield = 280 kg acetaminophen
Theoretical yield = 280 kg acetaminophen + 70 kg waste
percent yield = (actual yield / theoretical yield) x 100
percent yield = (280 / (280 + 70)) x 100 = 280/350 x 100 = 80%.
So the percent yield is 80%. This means that 80% of the theoretical yield was actually produced, and 20% of the theoretical yield was lost as waste.
(a) calculate δg°rxn for the dissolution of agcl(s).
The dissolution of agcl 55.7 kJ⋅mol−1, The free energy change for the dissolution of AgCl is 55.7 kJ⋅mol−1 and the solubility product of silver chloride is 1.7 × 10^-10.
What does the mathematical term "product" mean?The mathematical concept of "product" is the combination of more than one number. In those other words, a formula that specifies the multiplicands. The outcome of multiplication the two numbers together, multiplier and multiplicand, is the product.
AgCl(s) ⇄ Ag+(aq) + Cl−(aq)
ΔG∘rxn = 77.1 kJ⋅mol−1 + (−131.2 kJ⋅mol−1) - ( −109.8 kJ⋅mol−1)
ΔG∘rxn = 55.7 kJ⋅mol−1
Then;
ΔG∘rxn = -RTlnKsp
Ksp = e^-(ΔG∘rxn/RT)
Ksp = e^-(55.7 × 10^3J⋅mol−1 /8.314 × 298 K)
Ksp = 1.7 × 10^-10
What kind of thing is it?A product, or an expression that specifies factors to be multiplied, is what happens when you multiply two numbers in mathematics. For instance, 30 is the result of multiplying 6 by 5 to get 5.
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