if a sample of 0.500 moles of hydrogen sulfide was reacted with excess concentrated sulfuric acid, how many moles of sulfur dioxide would be produced

We use molality instead of molarity for our calculations because it is a more reliable measure of concentration, especially in cases where temperature changes can affect the volume of the solution.

Molality is defined as the number of moles of solute per kilogram of solvent, whereas molarity is defined as the number of moles of solute per liter of solution. Since molality is based on the mass of the solvent, it is not affected by changes in volume due to temperature changes, making it a more accurate measure of concentration. In contrast, molarity is based on the volume of the solution, which can change with temperature, resulting in inaccurate calculations. Molality is particularly useful in certain applications, such as in the preparation of solutions for cryogenics or in biochemistry.

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The main difference between a parallel and a series circuit is the amount of electricity flowing through each individual component. In a series circuit, the same amount of electricity circulates.

The letter [tex]I[/tex] which is derived from the French term , intensité du courant is usually used to represent current. (current intensity). Current intensity is commonly described by the word "current."

The[tex]I[/tex] symbol was used by André-Marie Ampère to create his force law, which is how the electric current unit is [tex]I[/tex] symbol

The ampere is the [tex]SI[/tex]measure for electrical current. [tex]I[/tex] is a symbol for electrical energy. A wire is said to have a current of[tex]1[/tex] ampere when charge flows through it at a pace of one conservation of mass per second. Example Solutions to the Electric Current Formula.

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The given statement is True, if the concentrations of a weak acid and its conjugate base differ by more than a factor of 5, the solution does not have the capacity to resist large pH changes.

A solution's ability to resist pH changes is known as its buffer capacity. Buffer solutions are made up of a weak acid and its conjugate base or a weak base and its conjugate acid. The buffer capacity is dependent on the concentrations of these components.
For a buffer to be effective, the concentrations of the weak acid and its conjugate base should be close to each other. Ideally, they should have equal concentrations for the maximum buffering capacity. If their concentrations differ by more than a factor of 5, the buffer capacity will be significantly reduced, and the solution will not be able to resist large pH changes effectively.
In summary, when the concentrations of a weak acid and its conjugate base differ by more than a factor of 5, it is true that the solution does not have the capacity to resist large pH changes. It is important to maintain appropriate concentrations of both the weak acid and its conjugate base to ensure effective buffering capacity in the solution.

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Explanation:

solubility of potassium nitrate (KNO3) at 5 oC ~ 24 g/100 mL H2O The solubility of potassium nitrate (KNO3) at 25 oC ~ 40 g/100 mL H2O Potassium nitrate (KNO3) is a solid.

The total energy required to heat 38.0 g of liquid water from 55 °C to 100 °C and change it to steam at 100 °C is 94.4 kJ.

First, let's break the problem into two parts:

1. Heating the liquid water from 55 °C to 100 °C

2. Changing the liquid water to steam at 100 °C

For part 1, we can use the formula:

Q = m * c * ΔT

Where Q is the amount of heat energy required, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Plugging in the values we have:

Q = 38.0 g * 4.18 J/goC * (100 °C - 55 °C)

Q = 8,692.4 J

This tells us that it takes 8,692.4 J of energy to heat the water from 55 °C to 100 °C.

For part 2, we need to find the energy required to change the water to steam. This is known as the molar heat of vaporization, which is the amount of energy required to turn one mole of a substance from a liquid to a gas.

The molar heat of vaporization of water is 40.6 kJ/mol. We need to figure out how many moles of water we have so we can use this value.

To do this, we can use the molar mass of water, which is approximately 18 g/mol.

38.0 g / 18 g/mol = 2.11 mol

So we have 2.11 moles of water.

Now we can use the formula:

Q = n * ΔH

Where Q is the amount of energy required, n is the number of moles of water, and ΔH is the molar heat of vaporization.

Plugging in the values we have:

Q = 2.11 mol * 40.6 kJ/mol

Q = 85.7 kJ

This tells us that it takes 85.7 kJ of energy to change 38.0 g of water to steam at 100 °C.

To find the total energy required, we can add the energy required for part 1 and part 2:

Total energy = 8,692.4 J + 85.7 kJ

Total energy = 94.4 kJ

The answer you are looking for ---> 1/2 x 0.156 mole Fe2O3 x 159.59 g/mole = 12.45 g Fe2O3.

Five ways to quantify reactants and products for ammonia are : Mole method ; Mass method ; Volume method (at STP) ; Volume method (at non-STP conditions)  and Number of particles method.

Substance that is present at the start of any chemical reaction is called as reactant.

The chemical equation for the synthesis of ammonia (NH3) is: N2(g) + 3H2(g) ⇌ 2NH3(g)

Mole method:

Coefficients in the balanced equation already represent mole ratios between reactants and products. In this method, we would simply write:

N2: 1 mole

H2: 3 moles

NH3: 2 moles

Pattern: 1:3:2

Mass method:

To determine the masses of reactants and products, we would use their molar masses and mole ratios from balanced equation. For example:

N2: 28.02 g

H2: 6.02 g

NH3: 34.02 g

Pattern: 28.02:6.02:34.02

Volume method (at STP):

At standard temperature and pressure (STP), one mole of any gas occupies 22.4 liters. Therefore, we can use mole ratios and volume of one mole of gas to determine the volumes of the reactants and products:

N2: 22.4 L

H2: 67.2 L

NH3: 44.8 L

Pattern: 1:3:2

Volume method (at non-STP conditions):

If the gases are not at STP, we need to use ideal gas law to convert between volume, pressure, temperature, and moles.

Number of particles method:

In this method, we would use Avogadro's number to convert between moles and number of particles (atoms, molecules, ions). For example:

N2: 6.02 x 10²³ particles

H2: 1.81 x 10²⁴ particles

NH3: 1.20 x 10²⁴ particles

Pattern: 1:3:2

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The number of moles of gas is doubled, the volume of the gas must also double. The new volume of gas is 8.00 L.

This can be expressed mathematically using the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature (assumed to remain constant).

We can rearrange the equation to solve for V:

[tex]V = \frac{nRT }{ P}[/tex]

We can plug in the known values to solve for the new volume:

[tex]V = \frac{(0.50 mol)(0.082 L-atm/K-mol)(273 K) }{ 1 atm}[/tex]

V = 8.00 L

Hence, the new gas volume is 8.00 L.

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Answer: the paper clip is denser 2.8 g/ml

Explanation: hope this helps

Rounded to the nearest tenth, answer is 0.5 moles of water.

Mass of a chemical compound divided by its amount of the substance measured in moles is molar mass.

Molar mass of HNO3 = 1(1.008) + 1(14.01) + 3(16.00) = 63.01 g/mol

Number of moles of HNO3 = 158.2 g / 63.01 g/mol = 2.51 mol

From the balanced equation, we see that 4 moles of water are produced for every 3 moles of Cu consumed. Therefore, number of moles of water produced is as:

2.51 mol HNO3 × (4 mol H2O / 8 mol HNO3) × (3 mol Cu / 8 mol HNO3) = 0.4719 mol H2O

Rounded to the nearest tenth, answer is 0.5 moles of water.

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A separating funnel can separate two immiscible liquids, oil and water. Because oil and water are fully insoluble in one other, they split into two distinct layers. The upper layer is made up of oil, whereas the lower layer is made up of water.

Or you could simply remove the oil layer from the top by pouring it into another vessel, which leaves you with the water layer at the bottom.

Answer:

same

Explanation:

the first answer is correct

The balanced equation tells us that we need 2 molecules of HCl to react with 2 molecules of Mg.

The balanced chemical equation is:

2 Mg + 2 HCl → 2 MgCl2 + H2

To balance this equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation. Here's how to balance it:

2 Mg + 2 HCl → 2 MgCl2 + H2

We see that there are already 2 magnesium atoms and 2 hydrogen atoms on the right-hand side, but only 1 hydrogen atom on the left-hand side. So we need to balance the hydrogen atoms by adding a coefficient of 2 in front of HCl:

2 Mg + 2 HCl → 2 MgCl2 + H2

Now we have 2 hydrogen atoms on both sides of the equation. However, we also added 2 chlorine atoms on the right-hand side, but only 1 chlorine atom on the left-hand side. To balance the chlorine atoms, we need to add a coefficient of 2 in front of MgCl2:

2 Mg + 2 HCl → 2 MgCl2 + H2

Now we have the same number of atoms of each element on both sides of the equation.

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The concentration of the nitric acid solution is 1.107 M.

We can calculate the concentration of the acid, we need to divide the volume of the acid (35 ml) by the volume of the potassium hydroxide (15.5 ml). The concentration of the nitric acid is then 2.25 m.

The concentration of acid in a 35 mL solution of nitric acid is calculated as follow

Here it is shown

Volume of nitric acid solution = 35 mL

Volume of potassium hydroxide solution = 15.5 mL

Concentration of potassium hydroxide solution = 2.5 M

Let the concentration of the nitric acid solution be C.

Moles of potassium hydroxide solution = concentration × volume = 2.5 × 15.5/1000 = 0.03875 moles

Since the acid and base are completely neutralized, the number of moles of acid and base must be equal.

So, Moles of nitric acid solution = 0.03875 M

Thus, concentration of nitric acid solution = moles/volume = 0.03875/(35/1000) = 1.107 M

Therefore, the concentration of the nitric acid solution is 1.107 M.

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According to the octet rule, atoms tend to achieve eight electrons in their outermost shell. So the correct answer is C. eight.

The octet rule is a chemical rule of thumb that states that atoms of low atomic number tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas. The rule is applicable to the main-group elements, especially carbon, nitrogen, oxygen, and the halogens. It is based on the observation that when atoms have eight electrons in their outermost shell, they are chemically stable and less likely to react with other atoms.

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A neutral nucleophile such as ammonia (NH₃) can be used to make CH₃CONH₂.

To make CH₃CO₂COCH₃ from acetyl chloride (CH₃COCl), a negatively charged nucleophile such as sodium acetate (CH₃COO⁻ Na⁺) can be used. The reaction would be:

CH₃COCl + CH₃COONa → CH₃CO₂COCH₃ + NaCl

To make CH₃CONH₂ from acetyl chloride (CH₃COCl), a neutral nucleophile such as ammonia (NH₃) can be used. The reaction would be:

CH₃COCl + NH₃ → CH₃CONH₂ + HCl

A neutral nucleophile is a molecule or atom that can donate a pair of electrons to form a new covalent bond with another molecule or atom without carrying an overall positive or negative charge.

Neutral nucleophiles typically have a lone pair of electrons that they can use to form a new bond, and they do not react as readily as charged nucleophiles.

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The specific rotation of the carbohydrate is 12.27 when observed rotation is 2.70 degrees at a concentration of 0.022 g/ml in a 1 dm cell

The specific rotation, denoted by [α], is a measure of the ability of a compound to rotate plane-polarized light and is defined as the observed rotation in degrees divided by the concentration in grams per milliliter and the path length in decimeters.

Mathematically, we can express it as:

[α] = observed rotation / (concentration x path length)

In this problem, we are given:

observed rotation = 2.70 degrees

concentration = 0.022 g/mL

path length = 1 dm = 10 cm

Substituting these values into the formula, we get:

[α] = 2.70 degrees / (0.022 g/mL x 10 cm)

[α] = 2.70 degrees / 0.220 g/cm³

[α] = 12.27

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The correct answer is option (B) indigestion tablets dissolving in water to produce carbon dioxide has the fastest reaction rate.

Reaction rate refers to the speed of a chemical reaction. In general, a chemical reaction proceeds at a faster rate if the temperature, pressure, and the concentration of the reactants is higher.

The following are the given options: a. Digestion of breakfast - The digestion of breakfast involves several chemical reactions, but it doesn't occur quickly, and the rate of reaction is slower.

b. Indigestion tablets dissolving in water to produce carbon dioxide - The reaction of indigestion tablets dissolving in water to produce carbon dioxide is an example of a chemical reaction that occurs rapidly. So, this is the fastest reaction rate among all.

c. Frozen meat going bad - The breakdown of frozen meat into various products is a slow process that occurs over a long period. Therefore, it has a very slow reaction rate.

d. Rusting a car frame - Rusting is an oxidation reaction that occurs between iron and oxygen, but it occurs gradually. It has a slower reaction rate.

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Answer:

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. It occurs due to the random movement of molecules and is temperature-dependent. Diffusion is important in processes such as gas exchange in the lungs and the absorption of nutrients from the small intestine.

Osmosis, on the other hand, is the movement of water molecules across a semipermeable membrane from an area of high water concentration to an area of low water concentration. In other words, it is the diffusion of water molecules. Osmosis is essential for many biological processes such as the transport of water from the roots to the leaves of plants and the regulation of water balance in animal cells.

Answer:

Diffusion : Tendency of particles in a gas or liquid to become evenly distributed by moving from areas of greater concentration to areas of lesser concentration.

Osmosis : Is the diffusion of water through a differential permeable membrane.

Explanation:

Diffusion example : When a perfume bottle is opened in a corner of a room the scent becomes distributed throughout the air in the room

Osmosis : Mesh bag filled with marbles and sand only the sand goes through

Answer:

To solve this problem, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional when temperature is held constant. This can be expressed as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

We can plug in the given values and solve for P2:

P1 = 1200 mmHg

V1 = 88 ml

V2 = 130 ml

P1V1 = P2V2

1200 mmHg * 88 ml = P2 * 130 ml

105600 mmHgml = 130P2 mlmmHg

105600 / 130 = P2

P2 = 811.08 mmHg

Therefore, the final pressure is approximately 811.08 mmHg.

Answer:

8

Explanation:

The chemical formula given is:

2 CH3CHC(OH)2 SH

To determine the number of oxygen atoms, we need to count the total number of oxygen atoms in each molecule and multiply it by the number of molecules.

Let's break down the formula:

CH3CHC(OH)2 represents one molecule.

In this molecule, there are 2 oxygen atoms present in each of the two (OH) groups.

Therefore, the total number of oxygen atoms in one molecule of CH3CHC(OH)2 is 2 × 2 = 4.

Now, we have 2 molecules of CH3CHC(OH)2, so the total number of oxygen atoms will be:

2 × 4 = 8

Therefore, the total number of oxygen atoms represented by the chemical formula is 8

[tex] \: [/tex]

The ratio of acid to base that is required to prepare a buffer with a pH of 4.0 using the conjugate pair hcooh/hcoo-1of (k_a = 1.78 x 10-4) is [HCOOHI]/[IHCOO-] = 3.99.

How to prepare buffer solution?

A buffer solution is a solution of a weak acid or base along with its salt. The main function of the buffer solution is to retain the pH value of the solution almost constant, even if a small quantity of a strong acid or base is added to it. The formula for buffer solution is BH+ + A-.

The ratio of the concentrations of conjugate acid and base species in a buffer solution is called buffer capacity.

It measures how much of an acid or base can be added to a solution before a significant change in pH occurs. The ideal buffer pH range is within 1 pH unit of the dissociation constant (pKa).

pH = pKa + log [A-] / [HA]

In this question, the given pH is 4.0 and the given pKa is 1.78 x 10-4.

Now, substituting these values in the above equation, we get pH = pKa + log [A-] / [HA]. 4.0 = -log1.78 x 10-4 + log [A-] / [HA] 4.0 + 4.25 = log [A-] / [HA]

Antilog of both sides to eliminate the logarithm from the right side of the equation

101.25 = [A-] / [HA]A- / HA = 101.25[HA] = A- / 101.25Ratio = HA / A-= [HA] / [A-]= 1 / 101.25= 0.0099= 1 / 101

Therefore, the required ratio of [HCOOHI] to [IHCOO-] is [HCOOHI] / [IHCOO-] = 3.99.

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Answer: 121.2416 psi

Explanation:

There are 13 ions in 6.5 moles of Cu2+ ions.  It is also used in stoichiometry calculations to determine the amount of reactants and products in a chemical reaction.

What is Molar Mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It is calculated by adding up the atomic masses of all the atoms in a molecule or formula unit of a compound. The molar mass of an element is the atomic mass of the element expressed in g/mol.

Molar mass is an important concept in chemistry, as it allows us to convert between mass and moles of a substance, and to determine the amount of substance present in a given mass.

To find the number of ions in 6.5 moles of Cu2+, we need to first determine the total number of ions present in 6.5 moles of Cu2+ ions.

One mole of Cu2+ ions contains 2 ions (as the 2+ charge is carried by each ion).

So, the total number of ions present in 6.5 moles of Cu2+ ions can be calculated as:

Number of ions = 2 ions/mole x 6.5 moles

Number of ions = 13 ions

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The rate constant for the uncatalyzed hydrolysis of the glycosidic bond in trehalose is 1.45 × 10⁻¹³ s⁻¹, and the rate enhancement for the glycosidic bond hydrolysis catalyzed by trehalase is 1.79 × 10¹⁶.

The rate constant for the uncatalyzed hydrolysis of the glycosidic bond in trehalose can be calculated using the half-life,  [tex]t_{1/2}[/tex], which is given as 6.6 × 10⁶ years:

[tex]t_{1/2}[/tex] = ln(2) / k

Rearranging this equation gives:

k = ln(2) / [tex]t_{1/2}[/tex]

Substituting the given values, we get:

k = ln(2) / 6.6 × 10⁶ years

Using the conversion factor 1 year = 31,536,000 s, we can convert the time unit from years to seconds:

k = ln(2) / (6.6 × 10⁶ years × 31,536,000 s/year)

k = 1.45 × 10⁻¹³ s⁻¹

The rate enhancement for the catalyzed reaction can be calculated using the following equation:

Rate enhancement = (kcat / kuncat)

where kcat is rate constant for catalyzed reaction, and kuncat is  rate constant for uncatalyzed reaction.

Substituting the given values, we get:

Rate enhancement = (2.6 × 10³ s⁻¹) / (1.45 × 10⁻¹³ s⁻¹)

Rate enhancement = 1.79 × 10¹⁶

Therefore, the rate enhancement for the glycosidic bond hydrolysis catalyzed by trehalase is 1.79 × 10¹⁶, which indicates that the catalyzed reaction is much faster than the uncatalyzed reaction.

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--The given question is incomplete, the complete question is

"The half-life for the hydrolysis of the glycosidic bond in the sugar trehalose is 6.6 × 10⁶ years. a. What is the rate constant for the uncatalyzed hydrolysis of this bond? [Hint: For a first-order reaction, the rate constant, k, is equal to 0.693/[tex]t_{1/2}[/tex].] b. What is the rate enhancement for glycosidic bond hydrolysis catalyzed by trehalase if the rate constant for the catalyzed reaction is 2.6 × 10³ s⁻¹?"--

Alpha particles are substantially larger and heavier than beta particles or gamma rays, which is why engineers chose a fuel that produces alpha particles as opposed to beta particles or gamma rays.

RTGs can be used in space missions when size, weight, and dependability are important considerations, although fusion and fission reactors are far larger and more sophisticated than RTGs.

It is simpler to build an effective energy conversion system since alpha decay is a highly predictable process that generates a consistent supply of energy.

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The intensity of an infrared (IR) absorption band depends on several factors, including:

Concentration of the sample: The intensity of the IR absorption band increases with the concentration of the sample.

Nature of the sample: The intensity of the IR absorption band depends on the chemical nature of the sample, including its functional groups, molecular weight, and structure.

Vibrational frequency of the bond: The intensity of the IR absorption band increases with the vibrational frequency of the bond. Bonds with higher vibrational frequencies absorb more strongly.

Polarizability of the bond: The intensity of the IR absorption band is related to the polarizability of the bond. Bonds that are more polarizable absorb more strongly.

Dipole moment of the molecule: The intensity of the IR absorption band is related to the dipole moment of the molecule. Molecules with higher dipole moments absorb more strongly.

Temperature: The intensity of the IR absorption band decreases with increasing temperature due to thermal effects on the vibrational energy levels.

Interactions with neighboring atoms or functional groups: The intensity of the IR absorption band may be influenced by interactions with neighboring atoms or functional groups, such as hydrogen bonding or steric effects.

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The concentration of strontium hydroxide [tex]Sr(OH)2[/tex] is zero at this point in the titration, so it does not contribute to the pH calculation.

To determine the pH of the solution at a particular point in the titration [tex]HC4H7O2[/tex], we need to construct a BCA (before, change, after) table and an ICE (initial, change, equilibrium) table.

The balanced chemical equation for the reaction is

[tex]2 HC4H7O2 + Sr(OH)2 → Sr(C4H7O2)2 + 2 H2O[/tex]

[tex]BCA Table:Reactant | HC4H7O2 | Sr(OH)2Initial | x | yChange | -2x | -yAfter | x-2x | y-y[/tex]

In the BCA table, we assume that x moles of Butyric acid [tex]HC4H7O2[/tex] and y moles of [tex]Sr(OH)2[/tex] are present in the reaction mixture. Since the stoichiometric coefficient  [tex]HC4H7O2[/tex] is 2 in the balanced equation, the change in its concentration is -2x moles, while for strontium hydroxide [tex]Sr(OH)2[/tex], it is -y moles. The final concentration of Butyric acid [tex]HC4H7O2[/tex] is (x-2x) moles and that of strontium hydroxide [tex]Sr(OH)2[/tex] is (y-y) moles.

From the ICE table, we can see that the initial concentration of Butyric acid [tex]HC4H7O2[/tex] is x moles and the concentration of[tex]H3O+[/tex] produced is 2x moles. Therefore, the pH at this point in the titration can be calculated as follows:

[tex]pH = -log[H3O+][H3O+] = 2x / V[/tex]

where V is the volume of the solution.

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The reason why an experimental design uses multiple reactions coupled together to measure the reaction rate is because this approach offers better accuracy and precision.

The coupled reaction is used to observe the progress of an enzyme-catalyzed reaction where an intermediate in the reaction is used as a substrate. A steady-state rate is determined by measuring the rate of consumption of the intermediate molecule by the enzyme.

The main reason for the use of multiple reactions coupled together is to produce better accuracy and precision. This is because measuring one reaction does not always provide a complete picture of the chemical process in question.

By coupling multiple reactions together, it is possible to obtain a more comprehensive understanding of the chemical process taking place. This approach also allows scientists to determine the rate of reactions more accurately and precisely. This means that the results obtained will be more reliable and therefore more valuable to the scientific community.

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The mass of sodium sulfate, Na₂SO₄ obtained, given that you started with 9.75 moles of sodium hydroxide, NaOH is 692.25 grams

First, we shall determine the mole of sodium sulfate, Na₂SO₄ obtained from the reaction. Details below:

H₂SO₄ + 2NaOH -> Na₂SO₄ + 2H₂O

From the balanced equation above,

2 moles of NaOH reacted to produce 1 mole of Na₂SO₄

Therefore,

9.75 moles of NaOH will react to produce = (9.75 × 1) / 2 = 4.875 moles of Na₂SO₄

Finally, we shall determine the mass of sodium sulfate, Na₂SO₄ obtained from the reaction. Details below:

Mole = mass / molar mass

4.875 = Mass of Na₂SO₄ / 142

Cross multiply

Mass of Na₂SO₄ = 4.875 × 142

Mass of Na₂SO₄ = 692.25 grams

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