Question

Consider the following reaction:

$CO_{(g)} + \frac{1}{2}O_{2(g)} \rightarrow CO_{2(g)}$

How are $\Delta$E and $\Delta$H related for the reactin?

• A. $\Delta H = \Delta E - 0.5RT$
• B. $\Delta H = \Delta E - RT$
• C. $\Delta H = \Delta E + 0.5RT$
• D. $\Delta H = \Delta E - 1.5RT$

Answer 1

Answer: (A)

$\Delta H = \Delta E - 0.5RT$

Answer 2

: $\Delta H = \Delta E + \Delta n_{g}RT$

$\Delta n_{g} = 1 - \frac{3}{2} = - \frac{1}{2}$ or $- 0.5$

Hence $\Delta H = \Delta E - 0.5RT$