7.5 Exercise 2

Using the bond energies in the table, determine the approximate enthalpy change for each of the following reactions:

(a) $\text{H}_{2} \left(g\right) + \text{Br}_{2} \left(g\right) \rightarrow 2 \text{HBr} \left(g\right)$

(b) $\text{CH}_{4} \left(g\right) + \text{I}_{2} \left(g\right) \rightarrow \text{CH}_{3} \text{I} \left(g\right) + \text{HI} \left(g\right)$

(c) $\text{C}_{2} \text{H}_{4} \left(g\right) + 3 \text{O}_{2} \left(g\right) \rightarrow 2 \text{CO}_{2} \left(g\right) + 2 \text{H}_{2} \text{O} \left(g\right)$