In an acidic environment, the nitrogen of the histidine side chain that is most likely to get protonated is the amino group nitrogen (NH2).
In the case of histidine, the two nitrogens in the side chain are referred to as the imidazole ring. The imidazole ring contains a pyridine-like structure with two nitrogen atoms, one of which is in the form of an amino group (NH2) and the other in the form of a pyrrole-like nitrogen (N).
In an acidic environment, the pH is low, and there are excess protons (H+) available. which means it would accept a hydrogen ion (H+) to become NH3+. This is because the amino group has a lone pair of electrons that can accept the proton, while the pyrrole-like nitrogen does not have a lone pair available for protonation.
Therefore, in an acidic environment, the nitrogen of the histidine side chain that is most likely to get protonated is the amino group nitrogen (NH2).
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a concentration in terms of volume/volume is used to describe which types of solutions? responses solutions with a solid solute and a liquid solute solutions with a solid solute and a liquid solute solutions with a liquid solvent and a solid solute solutions with a liquid solvent and a solid solute solutions with a solid solvent and a solid solute solutions with a solid solvent and a solid solute solutions with a liquid solvent and a liquid solute
A concentration in terms of volume/volume is used to describe a solution with a liquid solvent and a liquid solute.
A homogeneous mixture composed of two or more substances is called a solution.
In a solution, there are two primary components, which are termed as,
Solute.Solvent.The minor component that is dissolved in a solution is known as the solute. The major component that dissolves the solute is known as the solvent.
For a solid substance, it is preferred to use the mass of the solid than the volume of the substance.
Whereas, in the case of liquids it is preferred to use the volume of the liquid than the mass of the liquid.
Hence, if both the solute and solvent of the solution are liquid then only a concentration in terms of volume/volume is used to describe the solution.
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The rays that damage the skin are call?
Answer:
ultraviolet, or UV rays from the sun can damage yor skin. thats why you put on sunscreen lol
if the temperature of the hydrogen gas was underestimated, would this error cause the gas constant to be overestimated, underestimated, or remain unaffected? please explain your reasoning.
This error would cause the gas constant to be underestimated because the gas constant is a function of temperature and pressure.
If the temperature is underestimated, then the pressure calculated would be too high, resulting in an underestimation of the gas constant. The gas constant would remain unaffected because it does not depend on the temperature of the hydrogen gas. The gas constant is a physical constant which is the same for all gases regardless of their temperature or pressure. The gas constant is defined as the ratio of the universal gas constant (R) to the molar mass (M) of a particular gas. It is a measure of the ideal gas law and is equal to 8.3144598 joules per Kelvin per mole (J/K/mol). Therefore, an error in the temperature of the hydrogen gas would not affect the gas constant.
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How do you find the valence core and unpaired electrons?
To find the valence core and unpaired electrons of an atom or molecule, one must first identify the outer electrons of the atom or molecule.
This can be done by looking at the electron configuration of the atom or molecule. The valence core is the set of electrons in the outermost energy level, which is also referred to as the valence shell.
The number of unpaired electrons is equal to the number of electrons in the valence shell that is not part of a covalent bond.
To determine the number of unpaired electrons in a molecule, it is necessary to subtract the total number of electrons in covalent bonds from the total number of electrons in the valence shell.
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electron orbital transition a produces light with a wavelength of 690 nm. transition b involves half the energy of transition a. what wavelength (in nm) is the light it produces?
As electron orbital transition a produces light with a wavelength of 690 nm, the wavelength of the light produced by transition b is 1380 nm.
Calculating the Wavelength of Light Produced by Electron Orbital TransitionsThe energy of a photon is inversely proportional to its wavelength, so we can use the fact that transition b involves half the energy of transition a to determine the wavelength of the light it produces.
The energy of transition b is half that of transition a, so the wavelength of the light produced by transition b will be twice that of transition a. Therefore, the wavelength of the light produced by transition b is:
Wavelength b = 2 x Wavelength a
Wavelength b = 2 x 690 nm
Wavelength b = 1380 nm
So, the wavelength of the light produced by transition b is 1380 nm.
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The equation for the reaction of magnesium ribbon and hydrochloric acid is:
Mg(s) + 2HCl(ag) + MgCl2(ag) + H2
If 1.53 g magnesium reacted, how many moles of hydrogen gas was produced?
Mg(s) + 2HCl(ag) + MgCl2(ag) + H2
If 1.53 g magnesium reacted,0.064 g of hydrogen gas is produced.
From the balanced chemical equation, 1 mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas.
The molar mass of magnesium is 24.31 g/mol. Therefore, the number of moles of magnesium in 1.53 g of magnesium is:
1.53 g / 24.31 g/mol = 0.063 moles
According to the balanced chemical equation, 1 mole of magnesium produces 1 mole of hydrogen gas. Therefore, 0.063 moles of magnesium produce 0.063 moles of hydrogen gas.
The molar mass of hydrogen is 1.008 g/mol. Therefore, the mass of 0.063 moles of hydrogen gas is:
0.063 moles x 1.008 g/mol = 0.064 g
So, 0.064 g of hydrogen gas is produced.
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In the following redox reaction identify the element undergoing oxidation and the element undergoing reduction. 4NH3(g)+5O2(g)⟶4NO(g)+6H2O(g)
According to the question the element undergoing oxidation is nitrogen (N).
What is oxidation?Oxidation is a chemical reaction that involves the loss of electrons from an atom, molecule, or ion. This process creates an oxidized version of the original molecule or ion, which can often be identified by a change in color or smell. Oxidation reactions can occur in both organic and inorganic molecules. Examples of oxidation include the rusting of iron and the browning of an apple when exposed to air. Oxidation often results in the release of energy, which can be harnessed for various applications.
This is because it is gaining oxygen (O) atoms in the reaction. The element undergoing reduction is oxygen (O). This is because it is losing electrons (in the form of oxygen atoms) in the reaction.
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22.3.2 Test (CST): The Solar System
Question 7 of 10
In which coastal area is the tide rising to form a high tide?
A. One that is rotating toward the Sun
B. One that is rotating toward the Moon
C. One that is rotating away from the Moon
D. One that is rotating away from the Sun
In an ecosystem, the coastal area that is rotating toward the moon is the area where tide rising to form a high tide.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .
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A sample of 24 karat gold (pure gold), with a specific heat capacity of 0.130 J/g oC, was heated to 150.0oC and added to 50.00g of water in a calorimeter. The temperature in the calorimeter rose from 20.0oC to 45.0oC. What was the mass of the sample of gold that transferred its energy to the water?
The mass of the sample of gold that transferred its energy to the water is 22.7 g
What is Specific Heat Capacity ?
Specific heat capacity is the amount of heat required to raise the temperature of one unit of mass of a substance by one degree Celsius or Kelvin, without a change in phase. It is a physical property of the substance and is typically measured in units of J/(g·°C) or J/(g·K).
We can use the equation for heat transfer to solve this problem:
q = m * c * ΔT
where q is the heat transferred, m is the mass of the sample, c is the specific heat capacity, and ΔT is the change in temperature.
First, we need to calculate the heat transferred from the gold to the water:
q = m_gold * c_gold * ΔT_gold
where m_gold is the mass of the gold, c_gold is the specific heat capacity of gold, and ΔT_gold is the change in temperature of the gold.
ΔT_gold = 150.0oC - 20.0oC = 130.0oC
q = m_water * c_water * ΔT_water
where m_water is the mass of the water, c_water is the specific heat capacity of water, and ΔT_water is the change in temperature of the water.
ΔT_water = 45.0oC - 20.0oC
= 25.0oC
Now, we can set the two expressions for q equal to each other and solve for m_gold:
m_gold * c_gold * ΔT_gold = m_water * c_water * ΔT_water
m_gold = (m_water * c_water * ΔT_water) / (c_gold * ΔT_gold)
Substituting the given values:
m_gold = (50.00g * 4.184 J/g oC * 25.0oC) / (0.130 J/g oC * 130.0oC)
= 22.7 g
Therefore, the mass of the sample of gold that transferred its energy to the water is 22.7 g
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What is meant by redox reaction?
Answer:
A redox reaction, also known as oxidation-reduction reaction, is a type of chemical reaction in which the oxidation state of a molecule changes due to the transfer of electrons from one molecule to another molecule.
Answer:
A chemical reaction that takes place between an oxidizing substance and a reducing substance.
Explanation:
Select all the correct answers.
Which observation shows that a change in state of matter has occurred?
A) Wood burns, producing gas and an ashy residue.
B) Overnight, dew forms on the grass.
C) An alkali indicator changes color when added to a cleaner.
PLEASE BE ACCURATE!! THANK YOU!!:)
The observation that shows a change in state of matter has occurred is option A) Wood burns, producing gas and an ashy residue.
A change in state of matter refers to the transformation of a substance from one physical state to another, such as from solid to liquid, liquid to gas, or vice versa. In option A, when wood burns, it undergoes a chemical reaction known as combustion.
During combustion, the wood reacts with oxygen in the air and undergoes a transformation from a solid state to a gaseous state, producing gas (such as carbon dioxide and water vapor) as well as an ashy residue (solid carbon and other impurities remaining after the combustion process). This change in state is accompanied by the release of heat and light.
Option B, where dew forms on the grass overnight, does not indicate a change in state of matter. Dew formation is a physical process known as condensation, where water vapor in the air cools down and changes into liquid water droplets upon contact with a colder surface (such as grass). In this case, the state of matter remains the same (from a gaseous state to a liquid state), and no new substances are formed.
Option C, where an alkali indicator changes color when added to a cleaner, also does not represent a change in state of matter. It suggests a chemical reaction between the alkali indicator and the cleaner, resulting in a color change. However, the states of matter involved (liquid or solid) do not change during this process.
In summary, option A is the observation that indicates a change in state of matter, as it involves the transformation of wood from a solid state to a gaseous state during combustion.
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a doctor orders 120. ml of 4 % (m/v) ibuprofen. if you have 10. % (m/v) ibuprofen on hand, how many milliliters do you need? express the volume to two significant figures and include the appropriate units.
When we have 10% (m/v) ibuprofen on hand, we have to add 48ml of 10% (m/v) solution.
Lets say, we need 'x' ml of ibuprofen
the molecular weight of ibuprofen = 206.29 g/mol
now we know 4%(m/v) ibuprofen means 100ml of the total solution contains 4g of ibuprofen = 4g/206.29g/mol
= [tex]\frac{4}{206.29}[/tex]mol of ibuprofen
100 ml contains = [tex]\frac{4}{206.29}[/tex]mol
therefore 120 ml contains = = [tex]\frac{4}{206.29}[/tex] x 120 mol........(1)
10% (m/v) means 100ml contains mol
therefore we know 'x' ml is
10/206.29 × x mol........(ii)
we can say that (i) = (ii)
so we get,
120×4 = 10x
10x = 480
x = 48
so now we have to add 48ml of 10% (m/v) solution.
S₁×v₁ = S₂v₂
∴4 × 120 = 8 × v₂
v₂ = 48
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acid rain can damage your skin. group of answer choices true false only if you swim in an acidic lake
It is False that acid rain can damage your skin so the correct option among group of choices is (B) False.
Acid rain typically refers to rain with a pH below 5.6, which is more acidic than normal rain. While acid rain can damage certain materials, such as metals and buildings, it is unlikely to directly damage human skin. This is because the skin has a protective outer layer that helps to regulate the pH and prevent the penetration of harmful substances.
However, swimming in an acidic lake could potentially damage the skin, as the acid can disrupt the pH balance of the skin and cause irritation or burns. Additionally, exposure to acid rain can indirectly harm human health by damaging crops and forests, which can impact the food supply and air quality.
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in the lab you measured the initial mass of hydrated to be 9.5 grams. after heating the substance to a constant mass, you measure the final mass of the anhydrate to be 3.77 g. determine the percent by mass of water in the hydrated.
The percent by mass of water in the hydrated compound is 60.3%.
What is percentage by mass?Percentage by mass is a way to express the concentration of a solution or the composition of a mixture as a percentage of the total mass of the solution or mixture. It is calculated by dividing the mass of the solute or component of interest by the total mass of the solution or mixture and multiplying by 100%.
The formula for percentage by mass is:
Percentage by mass = (Mass of solute or component / Total mass of solution or mixture) x 100%
The mass of water in the hydrated compound can be calculated by subtracting the final mass of the anhydrate from the initial mass of the hydrated:
Mass of water = Initial mass of hydrated - Final mass of anhydrate Mass of water = 9.5 g - 3.77 g Mass of water = 5.73 g
The percent by mass of water in the hydrated compound can be calculated using the following formula:
Percent by mass = (Mass of water / Initial mass of hydrated) x 100%
Substituting the values we get:
Percent by mass = (5.73 g / 9.5 g) x 100% Percent by mass = 60.3%
Therefore, the percent by mass of water in the hydrated compound is 60.3%.
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chemistry, can someone walk me trough the steps and what i need to do, to solve this please! Along with the anserw would help so much!
A mole of Chromebooks lined up end to end would encircle the moon approximately 1.59 x 10^16 times.
What is the length of a standard-size school Chromebook?The length of a standard-size school Chromebook is 11.6 inches.
To determine the number of times a mole of Chromebooks lined up end to end would encircle the moon, we need to first convert the length of one Chromebook into meters and then multiply that by Avogadro's number, which is the number of particles in a mole.
One Chromebook is 11.6 inches long, which is approximately 0.2946 meters. Avogadro's number is 6.022 x 10^23.
So, the total length of a mole of Chromebooks lined up end to end would be:
0.2946 meters * 6.022 x 10^23 = 1.75 x 10^24 meters
The circumference of the moon is approximately 10,917 kilometers, which is equal to 10,917,000 meters.
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Hydrogen peroxide solution is used as a bleach and to clean oil paintings.
A solution of hydrogen peroxide contains 10g of hydrogen peroxide in
every 100 cm of solution. What is the concentration of the solution in g/dm"?
Answer:
Explanation:
To convert the concentration of the solution from g/100 cm to g/dm^3, we need to first convert the volume unit from cm^3 to dm^3.
1 dm^3 = 10^3 cm^3
So, if 100 cm^3 of the solution contains 10 g of hydrogen peroxide, then 10^3 cm^3 (1 dm^3) of the solution contains 10 g * (10^3 / 100) = 10^3 g = 1000 g.
Therefore, the concentration of the solution in g/dm^3 is 1000 g/dm^3.
suppose that aqueous solutions of barium nitrate and potassium carbonate are mixed. what is the name of the compound or compounds that precipitate? enter the name of the precipitate.
When aqueous solutions of barium nitrate and potassium carbonate are mixed, a precipitate of barium carbonate (BaCO3) will form.
A precipitate is a solid that forms and separates out of a solution when two or more soluble compounds are mixed together.
The balanced chemical equation for the reaction is:
Ba(NO3)2 (aq) + K2CO3 (aq) → BaCO3 (s) + 2 KNO3 (aq)
In this reaction, the barium cation (Ba2+) from barium nitrate (Ba(NO3)2) combines with the carbonate anion (CO32-) from potassium carbonate (K2CO3) to form the insoluble salt barium carbonate (BaCO3), which precipitates out of solution.
Note that the potassium cation (K+) and the nitrate anion (NO3-) remain in solution as soluble salts, potassium nitrate (KNO3).
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Which change occurs with the largest increase in entropy at 25oC25oC?A. Br2(l)→Br2(g)Br2(l)→Br2(g)B. C(graphite)→C(diamond)C(graphite)→C(diamond)C. H2O(s)→H2O(l)H2O(s)→H2O(l)D. HCl(g)+H2O(l)→H3O+(aq)+Cl−(aq)HCl(g)+H2O(l)→H3O+(aq)+Cl−(aq)
The largest change in entropy will be in c) C(graphite) -----> C(diamond).So,correct option is c.
Entropy is a logical idea, as well as a quantifiable actual property, that is generally usually connected with a condition of turmoil, haphazardness, or vulnerability. The term and the idea are utilized in assorted fields, from traditional thermodynamics, where it was first perceived, to the minuscule depiction of nature in measurable material science, and to the standards of data hypothesis. It has found far-going applications in science and physical science, in natural frameworks and their connection to life, in cosmology, financial aspects, social science, climate science, environmental change, and data frameworks remembering the transmission of data for telecommunication.
The thermodynamic idea was alluded to by Scottish researcher and designer William Rankine in 1850 with the names thermodynamic capability and intensity potential. In 1865, German physicist Rudolf Clausius, one of the main pioneers behind the field of thermodynamics, characterized it as the remainder of a little measure of intensity to the prompt temperature.
Hence,correct option is c.
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(Complete question) is:
Which change occurs with the largest increase in entropy at 25°C?
a)Br₂(l)----->Br₂(g)
b)Br₂(g)-------->Br(l)
c)C(graphite)-------->C(diamond)
d)H₂O(s)-------->H₂O(l)
calculate the mass percent (m/m) of a solution prepared by dissolving 56.27 g of nacl in 179.3 g of h2o .
The mass percent (m/m) of the solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O is 23.85%.To calculate the mass percent (m/m) of a solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O, we first need to calculate the total mass of the solution:
Total mass of solution = mass of solute + mass of solvent
Total mass of solution = 56.27 g NaCl + 179.3 g H2O
Total mass of solution = 235.57 g
Next, we can calculate the mass percent (m/m) of NaCl in the solution using the formula:
Mass percent (m/m) = (mass of solute / total mass of solution) x 100%
Mass percent (m/m) of NaCl = (56.27 g / 235.57 g) x 100%
Mass percent (m/m) of NaCl = 23.85%
Therefore, the mass percent (m/m) of the solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O is 23.85%.
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in lab you're required to make 250.0 ml of a 1.7 m naoh solution. how many grams of naoh should you measure out to make the solution
you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.
To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:
moles of solute = concentration (in M) x volume (in L)
First, we need to convert the volume from milliliters to liters:
250.0 mL = 250.0 / 1000 = 0.25 L
Now, we can plug in the values:
moles of NaOH = 1.7 M x 0.25 L
moles of NaOH = 0.425 mol
Finally, we can calculate the mass of NaOH required using its molar mass:
mass of NaOH = moles of NaOH x molar mass of NaOH
The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).
mass of NaOH = 0.425 mol x 40.00 g/mol
mass of NaOH = 17.0 g
Therefore, To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:
moles of solute = concentration (in M) x volume (in L)
First, we need to convert the volume from milliliters to liters:
250.0 mL = 250.0 / 1000 = 0.25 L
Now, we can plug in the values:
moles of NaOH = 1.7 M x 0.25 L
moles of NaOH = 0.425 mol
Finally, we can calculate the mass of NaOH required using its molar mass:
mass of NaOH = moles of NaOH x molar mass of NaOH
The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).
mass of NaOH = 0.425 mol x 40.00 g/mol
mass of NaOH = 17.0 g
Therefore, you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.
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If Kc = 0.042 for PCl3 (g) + Cl2 (g) ———-> PCl5 (g) at 500 K, what is the value of Kp for this reaction at this temperature?
Answer:
no answer
Explanation:
you can get the answer If you go back to your textbook
In order to combat the cold here on campus, you may have seen OSU facilities use a brine solution to de-ice the roads and sidewalks. Brine, a concentrated salt solution, better prevents and eliminates ice from the roads, but can be more costly to store and disburse along the roadways. Why is brine a more effective de-ice solution than solid ice melt products? Select all that apply. a.Brine is NOT more effective than traditional ice melt products. b. Since brine is already a solution, the Van't Hoff Factor is higher than solid salt, making the freezing point depression greater. c. Brine is a higher concentration than solid salts, making the freezing point depression greater.d. Freezing point depression requires a solution to occur. Brine starts as a solution, where solid salt must form a solution first. e. The brine solution can more evenly coat the surface of the road, making the ice prevention more widespread.
The brine a more effective de-ice solution than solid ice melt products the correct option is b. Since brine is a already a solution, the Van't Hoff Factor is higher than the solid salt, making the freezing point depression greater.
The Salt brine for the roads is the solution of the salt that is generally the sodium chloride and the water, and it will help to keep the roads safe and use as less salt. The brine is a already a solution, the Van't Hoff Factor is higher than the solid salt, forms the freezing point depression greater.
The Freezing point depression will requires the solution to occur. The Brine to starts the solution, where the solid salt will form the solution first.
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approximately what proportion of earth’s crust is composed of the elements oxygen and silicon?
Oxygen and silicon are the two most abundant elements in the Earth's crust, making up approximately 75% of the crust by weight.
The Earth's crust is composed of various elements, but two of the most abundant ones are oxygen and silicon. Oxygen is the most abundant element on Earth, and it makes up about 47% of the Earth's crust by weight. It is found in minerals like quartz, feldspar, and mica, and is an essential component of the Earth's atmosphere and biosphere.
Silicon is the second most abundant element in the Earth's crust and accounts for about 28% of its weight. It is found in minerals such as quartz, feldspar, and mica, and is also a key component in many human-made products, including computer chips and solar panels.
Together, oxygen and silicon make up approximately 75% of the Earth's crust by weight. Other significant elements include aluminum, iron, calcium, sodium, and potassium, while trace elements such as copper, zinc, and gold are present in small amounts. Understanding the composition of the Earth's crust is important for fields such as geology, mineralogy, and environmental science.
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a 1.07 g sample of a monoprotic acid is dissolved in water and titrated with 0.210 m koh. what is the molar mass of the acid if 26.5 ml of the koh solution is required to neutralize the sample?
The molar mass of the monoprotic acid, given that 1.07 g of the acid was dissolved in water is 192.27 g/mol
How do I determine the molar mass of the monoprotic acid?We'll begin by obtaining the mole of KOH in the solution. Details below:
Molarity of KOH = 0.210 MVolume of KOH = 26.5 mL = 26.5 / 1000 = 0.0265 LMole of KOH =?Mole = Molarity x Volume
Mole of KOH = 0.210 × 0.0265
Mole of KOH = 0.005565 mole
Next, we shall determine the mole of the monoprotic acid. Details below:
Balanced equation:
HA + KOH —> KA + H₂O
From the balanced equation above,
1 mole of KOH reacted with 1 mole of HA.
Therefore,
0.005565 mole of KOH will also react with 0.005565 mole of HA.
Finally, we shall determine the molar mass of the monoprotic acid. Details below:
Mole of monoprotic acid = 0.005565 moleMass of diprotic acid = 1.07 gMolar mass of monoprotic acid =?Molar mass = mass / mole
Molar mass of monoprotic acid = 1.07 / 0.005565
Molar mass of monoprotic acid = 192.27 g/mol
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What is defined as the mass of a substance per mole of that substance?
The mass of a substance per mole of that substance is defined as its molar mass. The molar mass of a substance is the mass in grams of one mole of that substance and is usually expressed in grams per mole (g/mol).
The molar mass of a substance is used to convert between the number of moles of a substance and its mass, which can be useful in various chemical calculations and reactions. For example, if you know the molar mass of a substance, you can calculate the number of moles present in a given mass of that substance by dividing the mass by the molar mass.
In addition to its use in chemical calculations, the molar mass of a substance is also used in determining the density of a substance, as well as in various other physical and chemical properties. The molar mass can also be used to compare different substances, as substances with a larger molar mass typically have different physical and chemical properties than substances with a smaller molar mass.
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Please help
What volume, in liters, of 4.0 M LiBr solution can be made using 100.0 g LiBr?
(LiBr; 86.44 g/mol) [?] L
ANS = 0.288 L can be made.
How can we find the volume?The first thing that you need to do here is to convert the mass of lithium bromide to moles by using the compound's molar mass.
The number of moles of the solute—in your example, lithium bromide—present per 1.00 L of the solution is simply referred to as the molarity of the solution.
For every 1.00 L of this solution, 4.00 moles of lithium bromide must be present in order to create a 4.00-M solution.
You may calculate how many litres of this solution can be made using the molarity of the solution as a conversion factor because you already know that your sample contains 1.1515 moles of lithium bromide.
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why is it more accurate to standardize the naoh with khp than to standardize with a solution of hcl?
It is more accurate to standardize the NaOH with KHP than to standardize with a solution of HCl because it is stable under the acid base reaction conditions and has a high molecular weight.
Titration processes may occasionally claim a standardization process to regularize a secondary standard using a primary standard. This is because a secondary standard is what will be used in the titration of a certain analyte and its original attention may not be known directly beforehand.
Strong base solutions need to be standardised since chemicals like NaOH will inadvertently pick up moisture from the air and react with gases like CO2 to produce undesired contaminants in the base's stock sample. As a result, we cannot be certain that the mass of NaOH pellets we measure to create a desired solution is the mass of NaOH itself. The bulk consists of all of the impurities together. As a result, we cannot be certain of the base concentration in the solution we make.
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in water, 1 mol of al(clo3)3 (aq) will dissociate into which ions?
In water, 1 mol of Al(ClO₃)₃ (aq) will dissociate into two moles of Al³⁺ ions and three moles of ClO³⁻ions.
In water, 1 mol of Al(ClO₃)₃ (aq) will dissociate into the following ions: Al³⁺and ClO³⁻.
When Al(ClO₃)₃ is dissolved in water, it will dissociate into its constituent ions. The Al³⁺ ion will separate from the three ClO³⁻ ions. This process is known as dissociation and is a common occurrence when ionic compounds are dissolved in water.
The resulting solution will contain Al³⁺ and ClO³⁻ions that are free to move around and interact with other ions in the solution. In summary, 1 mol of Al(ClO₃)₃ (aq) will dissociate into 1 mol of Al³⁺ ions and 3 mol of ClO³⁻ ions in water.
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What are atoms of the same element that have different mass numbers?
Answer: ISOTOPES
Explanation:
isotopes are different types of the same element, this could be because they have an extra neutron, for example.
however, this does not apply to atoms that lose or gain electrons.
for example, Hydrogen has an isotope called Deuterium (or Hydrogen-2) and Tritium (Hydrogen-3).
if you wanted to produce 4.30 grams of iron (iii) hydroxide, how many ml of 1.00 m fe(no3)3 would you need if you had excess sodium hydroxide?
If we wanted to produce 4.30 grams of iron (III) hydroxide, the ml of 1.00 M Fe(NO₃)₃ excess sodium hydroxide is 0.040 L.
The mass of the iron (III) hydroxide = 4.30 grams
The mass molar of iron (III) hydroxide = 106.87 g/mol
The moles of the iron (III) hydroxide = mass /molar mass
The moles of the iron (III) hydroxide = 4.30 / 106.87
The moles of the iron (III) hydroxide = 0.040 mol
The molarity = 1 M
The volume = moles / molarity
Volume = 0.040 / 1
Volume = 0.040 L
Thus, the volume of Fe(NO₃)₃ is 0.040 L.
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