Chapter 4, Problem 61QAP

Interpretation Introduction

(a)

Interpretation:

The number of moles of pyridine (unused in reaction of cisplatin) should be determined.

Concept introduction:

Number of moles is equal to the ratio of given mass to the molar mass.

The mathematical expression is given by:

Number of moles = $\frac{\text{given mass}}{\text{molar mass}}$

Molarity is defined as the ratio of number of moles of solute to the volume of the solution in liters.

The mathematical expression is given by:

Molarity = $\frac{\text{moles of solute }}{\text{volume of solution in liters}}$

Density is defined as the ratio of mass to the volume.

Density = $\frac{\text{Mass}}{\text{Volume}}$

Interpretation Introduction

(b)

Interpretation:

The number of moles of pyridine which react with one mole of cisplatin should be calculated.

Concept introduction:

The relation between the number of moles of the substances reacting in a reaction can be obtained from the balanced chemical equation for the reaction. From mass and molar mass of a substance, number of moles can be calculated as follows:

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

Here, m is mass and M is molar mass.