Chapter 5, Problem 54QP

Interpretation Introduction

Interpretation:

The enthalpy change of the reaction is to be calculated.

Concept introduction:

The change in enthalpy of a reaction, when reactants are converted to products, is the same whether the reaction takes place in one step or many steps. This law is known as Hess’s law.

On adding the thermochemical equations, the enthalpy change value is also added, which gives the enthalpy change of the net reaction.

On reversing any equation, the sign of enthalpy change value is changed to the opposite sign.