Chapter 4, Problem 49E

Interpretation Introduction

(a)

Interpretation:

The mass of sodium sulfide required to react completely with 27.8 mL of 0.163 M silver nitrate needs to be determined.

Concept introduction:

The ratio of moles in which reactant reacts and products are formed in a reaction is called stoichiometric ratio.

The molarity of solution is defined as number of moles of solute in 1 L of the solution. It is mathematically represented as follows:

$M=\frac{n}{V\left(\text{L}\right)}$

Here, n is number of moles of solute in 1 L of the solution.

For given mass of a solute, the number of moles can be calculated as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass of the solute.

Interpretation Introduction

(b)

Interpretation:

The mass of silver sulfide obtained when silver nitrate reacts with sodium sulfide in part need to be determined.

Concept introduction:

The ratio of moles in which reactant reacts and products are formed in a reaction is called stoichiometric ratio.

The molarity of solution is defined as number of moles of solute in 1 L of the solution. It is mathematically represented as follows:

$M=\frac{n}{V\left(\text{L}\right)}$

Here, n is number of moles of solute in 1 L of the solution.

For given mass of a solute, the number of moles can be calculated as follows:

$n=\frac{m}{M}$

Here, m is mass and M is molar mass of the solute.