Chapter 11, Problem 39A

Interpretation Introduction

Interpretation:

The mole ratio that can convert moles of A to moles of B should be determined.

Concept introduction:

The ratio of mass of substance to its molar mass is said to be number of moles of that substance.

The ratio of amount of any two compounds involved in a chemical reaction in terms of mole is said to be mole ratio, and used as a conversion factor between reactants and products.

Answer to Problem 39A

The mole ratio that can convert moles of A to moles of B is:

$\frac{b\text{ mol of B}}{a\text{ mol of A}}$

Explanation of Solution

The mole ratio is determined from the balanced chemical equation that is from the coefficients of a balanced chemical equation.

Now, to convert moles of A to moles of B their coefficients in balanced chemical equations are determined first. Let the coefficient of A be a and coefficient of B be b. then the mole ratio of A and B will be a:b which can be written as:

$\frac{a\text{ mol of A}}{b\text{ mol of B}}$

This can be rewritten as the ratio of mol of B to A as:

$\frac{b\text{ mol of B}}{a\text{ mol of A}}$

Hence, the mole ratio that can convert moles of A to moles of B is:

$\frac{b\text{ mol of B}}{a\text{ mol of A}}$