Chapter 5.5, Problem 3CP

Each diagram shows a systems before and after a chemical reaction along with the corresponding enthalpy of reactions. Determine the enthalpy of reaction for the last reaction represented.

$\begin{array}{l}\text{a)}\hfill \\ \text{240 kJ/mol}\hfill \\ \text{b)}\hfill \\ \text{90 kJ/mol}\hfill \\ \text{c)}\hfill \\ \text{-120 kJ/mol}\hfill \\ \text{d)}\hfill \\ \text{295 kJ/mol}\hfill \\ \text{e)}\hfill \\ \text{-315 kJ/mol}\hfill \end{array}$