Chapter 13, Problem 82A

Interpretation Introduction

Interpretation:

The reason for representation of coefficients in balanced chemical equation with molar amounts along with relative volumes is to be justified.

Concept introduction:

This is based on Avogadro’s Law. The law gives relation of volume occupied by gas with number of moles of gas.

According to it,

$\begin{array}{l}V\propto n\\ where\\ Visthevolumeofthegas\\ nisthenumberofthemoles\end{array}$

Answer to Problem 82A

Because Avogadro’s Law states that equal volumes of gases at same temperature and pressure contain equal number of molecules or moles.

Explanation of Solution

It is given by Avogadro’s Law that

Equal volumes of all gases at same temperature and pressure contain equal number of molecules or moles.

Therefore coefficients in balanced chemical equation represent not only molar amounts but also relative volumes for gases