Chapter 6, Problem 6.14P

(a)

Interpretation Introduction

Interpretation: A balanced equation and draw an approximate enthalpy diagram for combustion of 1 mol of ethane is to be determined.

Concept Introduction: An exothermic reaction releases heat and results in a decrease in enthalpy of the system. For exothermic reaction

  $\begin{array}{l}\Delta H_{\text{products}}>\Delta H_{\text{reactants}}\\ \Delta H<0\end{array}$

(b)

Interpretation Introduction

Interpretation: A balanced equation is to be written and an approximate enthalpy diagram for freezing of liquid water is to be drawn.

Concept Introduction: An exothermic reaction releases heat and results in a decrease in enthalpy of the system. For exothermic reaction

  $\begin{array}{l}\Delta H_{\text{products}}>\Delta H_{\text{reactants}}\\ \Delta H<0\end{array}$