How many grams of NH4Cl need to be added to 1.50 L of 0.400 M ammonia in order to make a buffer solution with pH of 8.58? Kb for ammonia is 1.77 x 10¯5

To determine the empirical formula of the anhydrous salt with a mass composition of 65.95% Ba and 34.05% Cl, we first need to convert these percentages into moles.
Assuming a 100g sample of the salt, we would have 65.95g of Ba and 34.05g of Cl.
Next, we need to calculate the moles of each element using their molar masses.
The molar mass of Ba is 137.33 g/mol and the molar mass of Cl is 35.45 g/mol.
Moles of Ba = 65.95 g / 137.33 g/mol = 0.4808 mol
Moles of Cl = 34.05 g / 35.45 g/mol = 0.9605 mol
To get the empirical formula, we need to divide each mole value by the smaller of the two. In this case, that is 0.4808.
0.4808 mol Ba / 0.4808 = 1 Ba
0.905 mol Cl / 0.4808 = 2 Cl
Therefore, the empirical formula of the anhydrous salt is BaCl2.

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The correct name for Br2O is bromine(I) oxide. This is because there are two bromine atoms and one oxygen atom in the compound. The correct option is C.

The Roman numeral I in parentheses indicates that bromine has a +1 oxidation state in this compound.

The other options are incorrect for various reasons.

Option A, bromine oxide, is not specific enough and could refer to several different compounds with varying ratios of bromine to oxygen.

Option B, dibromine monoxide, implies that there is only one oxygen atom, which is not the case.

Option D, bromine(II) oxide, implies that bromine has a +2 oxidation state, which is not the case in this compound.

Option E, bromate, refers to a different compound altogether, which has a different chemical formula and composition.

Therefore, the correct answer is C. bromine(I) oxide, which accurately reflects the composition and oxidation state of the elements in the compound.

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Answer:

False

Explanation:

kilo is 1,000

Mili is 1/1,000

Answer:

The electrophilic chlorination of aromatic compounds usually occurs with Cl2 and AlCl3 as the reaction conditions, where AlCl3 serves as a catalyst.

Explanation:

The given question represent the alpha decay of lawrencium, which is as follows: ²⁵⁶Lr₁₀₃ ⇒ ²⁵²Md₁₀₁ + ⁴He₂.

Alpha decay is a nuclear decay process in which an unstable nucleus changes into another element by emitting a particle of two protons and two neutrons. This emitted particle is known as an alpha particle and is simply a helium nucleus. Alpha particles usually have a relatively large mass and positive charge. This large mass means that alpha particles cannot travel very far in the air or penetrate solids very deeply. Alpha decay is rarely used in external medical radiotherapy because alpha particles act only on surfaces.

Alpha decay was firstly distinguished from other forms of radiation by Ernest Rutherford by observing the deflection of radiation due to magnetic fields. Alpha particles have a charge of +2e, so alpha decay is deflected, as would be expected of a positive particle.

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The hydrogen bonds in the beta-pleated sheet are perpendicular to the direction of the protein chain, whereas, in the alpha helix, they are parallel to the direction of the protein chain. This results in different structural characteristics and functions for each of these secondary structures.

The beta-pleated sheet consists of strands of amino acids that run parallel or anti-parallel to each other, forming a sheet-like structure. The hydrogen bonds between adjacent strands hold them together, resulting in a stable, rigid structure.

The direction of the hydrogen bonds in the beta-pleated sheet allows for flexibility and the ability to withstand stress from different directions. In contrast, the alpha helix consists of a single, tightly coiled strand of amino acids that is stabilized by hydrogen bonds running along its length.

This results in a strong, stable structure that is suited for roles such as providing structural support or serving as a binding site for other molecules.

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The given structure is of formaldehyde an organic compound and it is acidic in nature.

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If the Gibbs free energy change (∆G°) for a reaction is zero, it means that the reaction is in a state of equilibrium, where the forward and reverse reactions are occurring at equal rates.

The equilibrium constant (K) for a chemical reaction is related to the Gibbs free energy change (∆G°) of the reaction through the equation:

∆G° = -RT ln(K)

where R is the gas constant, T is the temperature in Kelvin, and ln is the natural logarithm.

If ∆G° = 0, then:

0 = -RT ln(K)

which means that ln(K) = 0, or K = 1. Therefore, the value of the equilibrium constant for a reaction at equilibrium with ∆G° = 0 is 1.

If we begin the reaction with pure products, the reaction will proceed in the reverse direction until equilibrium is reached, according to Le Chatelier's principle. This means that the concentration of the products will decrease and the concentration of the reactants will increase until the equilibrium constant is reached, which is 1 in this case.

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In a highly basic solution with a pH of 13, the dominant form of glycine would be NH2—CH2—COO−. The correct option is B).

In a highly basic solution with a pH of 13, glycine, which is an amino acid, undergoes deprotonation. Deprotonation is a process in which a molecule loses a proton, and as a result, its pH increases. When glycine undergoes deprotonation, the NH3+ group on the amino acid loses a proton, and the resulting molecule is NH2—CH2—COO−. This means that the dominant form of glycine in a highly basic solution with a pH of 13 is NH2—CH2—COO−, which is option B.

The reason for this is that in a highly basic solution, there are a large number of hydroxide ions (OH−) present. These hydroxide ions readily accept protons from glycine's NH3+ group, causing it to lose its positive charge and become NH2. The resulting molecule, NH2—CH2—COO−, is negatively charged and stable in the highly basic solution.

In summary, in a highly basic solution with a pH of 13, the dominant form of glycine is NH2—CH2—COO−, which is option B. This is because the NH3+ group on the amino acid loses a proton in the presence of hydroxide ions, resulting in a negatively charged and stable molecule.

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The concentration of hydroxide ions (OH-) in a solution is related to the pH, a measure of acidity or alkalinity. The pH scale ranges from 0 to 14, with a pH of 7 indicating a neutral solution. Higher pH values indicate increasing alkalinity, while lower pH values indicate increasing acidity.

For the solutions with the highest pH studied, the concentration of hydroxide ions would be the highest, as an increase in OH- ions contributes to a more alkaline solution. To find the concentration of OH- ions, we can use the relationship between pH and pOH, where:

pH + pOH = 14

The highest pH studied is not provided, we can consider the maximum pH value of 14. In this case, the pOH would be 0 (since pH + pOH = 14). The concentration of OH- ions can be determined using the equation:

[OH-] = 10^(-pOH)

The pOH value of 0, we find the concentration of hydroxide ions in the solution:

[OH-] = 10^(-0) = 10^0 = 1 mol/L

The solution with the highest pH studied (assuming pH = 14), the concentration of hydroxide ions is 1 mol/L.

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Environmental modifications can be considered "any equipment that changes the environment for everyone who shares space with the patient" (Dutton, 1995, p178).

These modifications aim to provide access, promote independence, safety, energy conservation, work simplification, and joint protection. Some examples of environmental modifications include:

1. Fixed toilet frames: These provide support for individuals who have difficulty sitting or standing when using the toilet.
2. Raised toilet seats: These make it easier for individuals with limited mobility to sit down and stand up from the toilet.
3. Grab rails: Installed near stairs, in bathrooms, or other areas where extra support is needed, grab rails help individuals maintain their balance and prevent falls.
4. Car adaptations: These can include hand controls, wheelchair lifts, and other modifications that make it easier for individuals with disabilities to operate or access a vehicle.
5. Ramps: Ramps provide a gradual incline, allowing wheelchair users and others with mobility impairments to access buildings and other areas with elevation changes.
6. Widening doorways: By increasing the width of doorways, individuals using wheelchairs, walkers, or other mobility aids can easily pass through.
7. Walk-in showers: These showers have a low or no threshold, making it easier for individuals with mobility impairments to enter and exit the shower area.

These are just a few examples of environmental modifications that can improve the quality of life for individuals with various physical limitations and disabilities.

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There are 0.359 moles of Be in the thin-foil window. To determine the number of moles of Beryllium (Be) in a thin-foil window weighing 3.24 g, we need to use the molar mass of Be, which is 9.012 g/mol.

First, we need to calculate the number of moles of Be in 3.24 g by dividing the weight by the molar mass:

3.24 g ÷ 9.012 g/mol = 0.359 moles of Be

Therefore, there are 0.359 moles of Be in the thin-foil window.

Beryllium is commonly used in X-ray windows for its transparency to X-rays and high melting point. This makes it ideal for medical imaging instruments as it allows the X-rays to pass through the window and reach the imaging sensor, while also being able to withstand the high temperatures generated by the X-ray equipment.

However, beryllium is a toxic metal and requires special handling and disposal procedures to ensure the safety of workers and the environment.

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An important fact about resonance structures and the nuclei is that the positions of the nuclei remain the same in all resonance structures of a molecule.

In the resonance structures depict the delocalization of electrons within a molecule, while the positions of the nuclei remain unchanged. This means that the nuclei stay in place, and only the electron distribution changes among the different resonance structures, resulting in an average or hybrid electron configuration that contributes to the overall stability of the molecule.

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Answer:

pH ≈ 4.21

The acidity of a solution can be expressed as:

pH = -log₁₀[H⁺] = -log₁₀[H₃O⁺]. Historically, pH is an acronym for "potential of Hydrogen". The scale goes from 1 to 14, where acidic solutions are measured to have lower pH values than basic or alkaline solutions. a pH of 7 represents a neutral solution. Pure distilled water has a pH of 7, whereas drinking water has a slightly greater pH than 7, due to the chemicals added to eliminate harmful bacteria.

Generally, in calculating pH, we use the formula: pH = -log₁₀[H⁺], where [H⁺] = concentration of hydrogen ions. However, sometimes the formula pH = -log₁₀[H₃O⁺] may also be used where [H3O+] = hydronium ion concentration. The hydronium ion is basically just the H⁺ ion released that bonds with the H₂O molecule to form H₃O⁺. The two above formulas can be used interchangeably.

To calculate the pH of a solution with [H₃O⁺] = 6.19×10⁻⁵ M:

pH = -log₁₀(6.19×10⁻⁵) ≈ 4.208

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Since we can only produce a maximum of 6 units of Y from the X, it is the limiting reactant. Therefore, the limiting reactant is B) X.

To determine the limiting reactant in the generic chemical equation 2W + 3X → 3Y + Z, follow these steps:

1. Calculate the ratio of available reactants to the required reactants in the equation. In this case, we have 5 units of W and 6 units of X. The ratio of available W to required W is 5/2, and the ratio of available X to required X is 6/3.

2. Determine which ratio is smaller. The W ratio is 5/2 = 2.5, and the X ratio is 6/3 = 2. The smaller ratio is for X.

3. The reactant with the smaller ratio is the limiting reactant, as it will be consumed first, preventing further reaction. In this case, the limiting reactant is X.

So, the correct answer is: B) X

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The carbinolamine intermediate contains a nitrogen atom with a lone pair of electrons and a hydroxyl group (-OH) attached to a carbon atom. Protonation of the carbinolamine can occur in two ways:1.Protonation of nitrogen and 2. Protonation of the hydroxyl group

In the hydrolysis of an imine to produce a ketone and methylamine, the first step is the addition of water to the imine to form a carbinolamine intermediate.

The carbinolamine intermediate contains a nitrogen atom with a lone pair of electrons and a hydroxyl group (-OH) attached to a carbon atom. Protonation of the carbinolamine can occur in two ways:

Protonation of the nitrogen atom: In this case, the lone pair of electrons on the nitrogen atom accepts a proton (H+) to form an ammonium ion. The resulting species is unstable and loses a proton from the hydroxyl group, leading to the formation of the ketone and methylamine.

Protonation of the hydroxyl group: In this case, the hydroxyl group accepts a proton (H+) to form an oxonium ion. The nitrogen lone pair then attacks the carbonyl carbon, leading to the formation of the ketone and methylamine.

Overall, both pathways lead to the formation of the same products, but the protonation of the nitrogen atom is the more commonly observed pathway.

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The technology that describes how super-resolution imaging can track a single molecule inside of a cell, even though the resolution limit of light is much larger than the molecule being tracked is fluorescent em. The correct option is D.

A fluorescent microscopy is a powerful tool for imaging biological samples. However, the diffraction limit of light makes it difficult to resolve individual molecules or structures that are smaller than the wavelength of light.

Super-resolution microscopy overcomes this limit by using various techniques to enhance the resolution of the images beyond the diffraction limit of light.

One such technique is single-molecule localization microscopy, which uses fluorescent probes to track individual molecules.

By carefully analyzing the emitted fluorescent signals, it is possible to precisely locate the position of the individual molecules, even if they are smaller than the diffraction limit of light.

This can be achieved by computing the central peak position based on the intensity profile, which allows for the tracking of a single molecule inside a cell with high spatial resolution.

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The pH of the buffer solution is 4.76.

To calculate the pH of the buffer solution, we need to use the Henderson-Hasselbalch equation, which is given by:

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

where pKa is the dissociation constant of the weak acid, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

For acetic acid (CH3COOH), the pKa is 4.76.

Since the buffer solution contains equal concentrations of acetic acid and sodium acetate, we can assume that [A-] = [CH3COO-] = 1.00 M and M[HA] = [CH3COOH] = 1.00 M.

Therefore, plugging in these values into the Henderson-Hasselbalch equation, we get:

pH = 4.76 + log([1.00]/[1.00]) = 4.76

Therefore, the pH of the buffer solution is 4.76.

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The volumes of 0.100 M acetic acid and 0.100 M sodium acetate that would be required to produce 1.00 L of buffer at pH 4.000 are 437 mL of acetic acid and 313 mL of sodium acetate.

To calculate the volumes of acetic acid and sodium acetate required to prepare a buffer at pH 4.000, we need to use the Henderson-Hasselbalch equation:

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

where pH is the desired pH of the buffer, pKa is the dissociation constant of the weak acid (acetic acid), and [A-]/[HA] is the ratio of the concentration of the conjugate base (acetate ion) to the concentration of the weak acid (acetic acid).

Rearranging the equation, we get:

[A-]/[HA] = 10^(pH - pKa)

Substituting the given values, we get:

[A-]/[HA] = 10^(4.000 - 4.752) = 0.563

This means that the concentration of the acetate ion should be 0.563 times the concentration of the acetic acid in the buffer.

Let's assume we want to prepare 1.00 L of the buffer. Since the concentrations of both acetic acid and sodium acetate are the same (0.100 M), we can use the formula for the total concentration of a solute in a solution:

C = n/V

where C is the concentration, n is the quantity of solute, and V is the volume of the solution.

We may use the following formula to calculate the amount of acetic acid required:

n(acetic acid) = C(acetic acid) x V(total) x [HA]/([A-] + [HA])

where [HA]/([A-] + [HA]) is the ratio of the concentration of the weak acid to the total concentration of acid (weak acid + conjugate base).

Substituting the given values, we get:

n(acetic acid) = 0.100 x 1.00 x 0.437/ (1 + 0.563) = 0.0437 mol

To calculate the volume of acetic acid needed, we can use:

V(acetic acid) = n(acetic acid)/C(acetic acid)

Substituting the calculated value of n(acetic acid) and the given value of C(acetic acid), we get:

V(acetic acid) = 0.0437/0.100 = 0.437 L = 437 mL

Similarly, to calculate the amount and volume of sodium acetate needed, we can use:

n(sodium acetate) = C(sodium acetate) x V(total) x [A-]/([A-] + [HA])

Substituting the given values, we get:

n(sodium acetate) = 0.100 x 1.00 x 0.563/ (0.563 + 1) = 0.0313 mol

V(sodium acetate) = n(sodium acetate)/C(sodium acetate)

Substituting the calculated value of n(sodium acetate) and the given value of C(sodium acetate), we get:

V(sodium acetate) = 0.0313/0.100 = 0.313 L = 313 mL

Therefore, to prepare 1.00 L of a buffer at pH 4.000 using 0.100 M acetic acid and 0.100 M sodium acetate, we need to mix 437 mL of acetic acid and 313 mL of sodium acetate.

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The name for H2SO4 is A) sulphuric acid. also called as vitriol.

Sulfuric acid (H2SO4) is a highly corrosive and dense liquid that is commonly used in a variety of industrial processes.

It is a strong acid that is capable of reacting with many substances, and it is commonly used in the production of fertilizers, detergents, and other chemicals.

Sulfuric acid is also used in the processing of metals such as zinc and copper, and it is used in the production of batteries, dyes, and explosives.

properties of sulfuric acid:

Dehydrating agent: Sulfuric acid is a powerful dehydrating agent and is used in the production of many organic chemicals, such as plastics and synthetic fibers.

pH control: Sulfuric acid is commonly used to adjust the pH of solutions in laboratory experiments and industrial processes.

Battery production: Sulfuric acid is used in the production of lead-acid batteries, which are commonly used in cars and other vehicles.

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According to valence bond theory, the hybridizations for the indicated atoms of acrylamide can be predicted by examining the atomic orbitals involved in the formation of the molecule.

Acrylamide (C3H5NO) contains carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) atoms and there are two carbon atoms that form a double bond (C=C). Each of these carbon atoms undergoes sp2 hybridization, resulting in three sp2 hybrid orbitals that form sigma bonds with neighboring atoms. One of the carbon atoms is also bonded to a hydrogen atom, and the other is bonded to the amide group (-CONH2). The nitrogen atom in the amide group is sp3 hybridized, it forms three sigma bonds with two hydrogen atoms and the carbon atom, and has a lone pair in one of the sp3 hybrid orbitals.

The oxygen atom in the amide group is sp2 hybridized, forming two sigma bonds with the neighboring nitrogen and carbon atoms, and possessing a lone pair in one of its sp2 hybrid orbitals. In summary, according to valence bond theory, the hybridizations for the indicated atoms of acrylamide are as follows: the two carbon atoms in the double bond are sp2 hybridized, the nitrogen atom in the amide group is sp3 hybridized, and the oxygen atom in the amide group is sp2 hybridized. According to valence bond theory, the hybridizations for the indicated atoms of acrylamide can be predicted by examining the atomic orbitals involved in the formation of the molecule.

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The pH of the final solution can be determined by calculating the amount of hydrogen ions present in the solution after combining the two different solutions.

The NH3 solution contains 0.32 moles of NH3, which will produce 0.32 moles of H+ ions in the solution. The NH4NO3 solution contains 0.18 moles of NH4NO3, which will produce 0.18 moles of H+ ions in the solution. When the two solutions are combined, the total moles of H+ ions in the buffer solution will be 0.5 moles.

Since the volume of the buffer solution is 265 mL, the concentration of H+ ions in the solution will be 0.5/0.265 = 1.89 M. The pH of a solution with a concentration of 1.89 M H+ ions will be -log[1.89] = 0.74. Thus, the pH of the final buffer solution is 0.74.

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5000 meters is equivalent to 5 kilometers.

To convert a distance in meters to kilometers, you should use the conversion factor of 0.001. This means that there are 0.001 kilometers in 1 meter.

So, to convert a distance in meters to kilometers, you would divide the distance in meters by 1000 (or multiply by 0.001). For example, if you have a distance of 5000 meters, you can convert it to kilometers by dividing 5000 by 1000:

5000 meters ÷ 1000 = 5 kilometers

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Answer: 0.756 moles

Explanation:

1 mole of NH2 has 6.022 x 10^23 molecules therefore:

(4.55x10^23)/(6.022x10^23)= 0.7555 moles or 0.756 using sig

The most likely van't Hoff factor for an 0.01 m [tex]$CaI_{2}$[/tex] solution is e. 3.00.Option (E)

The van't Hoff factor is the ratio of moles of particles in solution to the moles of solute particles dissolved. Calcium iodide dissociates into three ions in solution, one calcium ion and two iodide ions (I-), so the van't Hoff factor for a  solution is expected to be greater than one.

The most likely van't Hoff factor for a 0.01 M [tex]$CaI_2$[/tex] solution is 3.00, as indicated in the answer key. This is because each mole that dissolves produces three moles of particles in solution, consisting of one [tex]Ca^{2+}[/tex] and two I- ions.

Therefore, the concentration of particles in solution is three times greater than the concentration of dissolved, resulting in a van't Hoff factor of 3.00.

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a. The entropy change (∆S) for this reaction will be negative.

b. The entropy change for this reaction will also be negative.

c. In this reaction, the entropy change will likely be positive.

d. The entropy change for this reaction is expected to be positive.

a. PCl3(g) + Cl2(g) → PCl5(g): The entropy change (∆S) for this reaction will be negative, as the number of gaseous molecules decreases from two reactants to one product, indicating a decrease in disorder.

b. SO2(g) + CaO(s) → CaSO3(s): The entropy change for this reaction will also be negative. The gaseous SO2 molecule is becoming a part of the solid product, leading to a decrease in the system's overall disorder.

c. CO2(g) + H2O(l) → H2CO3(aq): In this reaction, the entropy change will likely be positive. Although CO2 gas is becoming a part of the aqueous product, the increase in the number of solute particles in the solution contributes to an increase in disorder.

d. Ni(s) + 2HCl(aq) → H2(g) + NiCl2(aq): The entropy change for this reaction is expected to be positive. The solid Ni is replaced by the gaseous H2, which increases the disorder in the system. Additionally, the number of solute particles in the solution increases, contributing to the positive entropy change.

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0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead, based on the mole ratio obtained from the balanced chemical equation.

The given chemical equation shows the reaction of lead with hydrochloric acid to produce lead(II) chloride and hydrogen gas. The coefficients of the reactants and products in the balanced chemical equation indicate the mole ratios of the reactants and products.

According to the equation, 1 mole of lead reacts with 2 moles of hydrochloric acid to produce 1 mole of lead(II) chloride and 1 mole of hydrogen gas.

Therefore, to calculate the amount of hydrochloric acid needed to react completely with 0.36 moles of lead, we can use the mole ratio obtained from the balanced chemical equation.

Since 1 mole of lead reacts with 2 moles of hydrochloric acid, we can say that 0.36 moles of lead would react with 2 x 0.36 = 0.72 moles of hydrochloric acid. Therefore, 0.72 moles of hydrochloric acid are needed to completely react with 0.36 moles of lead.

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An uncompetitive inhibitor is a type of enzyme inhibitor that binds to the enzyme-substrate complex, preventing the release of the product and reducing the number of available enzyme-substrate complexes.

This type of inhibition only occurs when the substrate is bound to the enzyme, and the inhibitor can only bind to the enzyme-substrate complex.

As a result of the binding of the uncompetitive inhibitor to the enzyme-substrate complex, the reaction cannot proceed normally and the maximum reaction rate (Vmax) is reduced.

This is because the inhibitor reduces the effective concentration of the enzyme-substrate complex available to react and form the product.

Moreover, the presence of an uncompetitive inhibitor also causes a decrease in the Michaelis-Menten constant (Km) value, as the inhibitor can only bind to the enzyme-substrate complex and not the free enzyme or substrate.

The reduction in Km indicates that the inhibitor has increased the affinity of the enzyme for the substrate.

Overall, uncompetitive inhibitors decrease the Vmax and Km values of enzyme-catalyzed reactions, leading to a decrease in the overall reaction rate.

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Answer:

Spectroscopy

Explanation:

The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy. Today, this process uses instruments with a grating that spreads out the light from an object by wavelength. This spread-out light is called a spectrum.

9.58 g of [tex]Na$_2$S[/tex] remains as excess reactant after the reaction goes to completion. Option (C)

We have already determined that [tex]CuSO$_4$[/tex] is the limiting reactant and that 0.0758 moles  [tex]CuSO$_4$[/tex] will react completely to form 0.198 g of CuS.

To determine the mass of excess [tex]Na$_2$S[/tex], we can use stoichiometry and the balanced chemical equation to calculate the amount  [tex]Na$_2$S[/tex] that would react completely with the given amount of [tex]CuSO$_4$[/tex]:

[tex]\text{mol CuSO}_4 &= \frac{12.1\text{ g}}{159.61\text{ g/mol}} = 0.0758\text{ mol}[/tex]

[tex]\text{mol Na}_2\text{S required} &= 0.0758\text{ mol CuSO}_4 \times \frac{1\text{ mol Na}_2\text{S}}{1\text{ mol CuSO}_4} = 0.0758\text{ mol}[/tex]

[tex]\text{mol Na}_2\text{S excess} &= 0.198\text{ mol CuS produced} \times \frac{1\text{ mol Na}_2\text{S}}{1\text{ mol CuS}} - 0.0758\text{ mol Na}_2\text[/tex]

[tex]\text{mass Na}_2\text{S excess} &= \text{mol Na}_2\text{S excess} \times \text{molar mass of Na}_2\text{S}[/tex]

[tex]&= 0.1222\text{ mol} \times 78.04\text{ g/mol}[/tex]

[tex]&= \boxed{\text{(C) 9.58 g)}}\end{align*}[/tex]

Therefore, 9.58 g of [tex]Na$_2$S[/tex] remains as excess reactant after the reaction goes to completion

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