Chapter 6, Problem 6.56P

Interpretation Introduction

Interpretation:The value of $\Delta H^0{}_f$ of ${\text{C}}_{\text{2}}{\text{H}}_{\text{2}}$ is to be calculated.

Concept introduction: The quantity of energy released during combustion of an organic compound is known as enthalpy of combustion. The formula of determination of $\Delta H_{\text{rxn}}$ is as follows:

  $\Delta H^0{}_{\text{rxn}}={\displaystyle \sum _{}^{}m\Delta H^0{}_{\text{f}}(\text{products})-}{\displaystyle \sum n\Delta H^0{}_{\text{f}}}(\text{reactants})$

Here, ${\displaystyle \sum }$ represents the sum of terms, m and n are number of moles of products and reactants respectively. The term $H^0{}_{\text{f}}$ is standard heat of formation.