Chapter 20, Problem 20.85SP

Interpretation Introduction

Interpretation:

The mass change in grams in the formation of 1 mole of ${\text{H}}_{\text{2}}$ and 1 mole of $\text{CO}$ needs to be determined.

${\text{C}}_{\text{(s)}}{\text{ + H}}_{\text{2}}{\text{O}}_{\text{(g)}}\stackrel{}{\to }{\text{CO}}_{\text{(g)}}{\text{ + H}}_{\text{2}}{}_{\text{(g)}}\text{ ΔH° = +131 kJ}$

Concept introduction:

A chemical reaction involves the conversion of certain chemical compounds to certain new substances which are called as product and the substances which involve in the chemical reaction are called as reactant.

Hence chemical reactions can be considered as the conversion of reactant to product through making or breaking of certain chemical bonds.

The energy change of reaction is associated with the mass change with Einstein’s mass − energy equation:

${\text{ΔE= m × c}}^{\text{2}}$

The mass change can be calculated as the difference in the mass of product and mass of reactant.