For the process (mathrm{H}_{2} mathrm{O}(l) longrightarrow mathrm{H}_{2} mathrm{O}(g)) at (298 mathrm{~K}) and 1.0 atm, (Delta H) is

Question:

For the process $\mathrm{H}_{2} \mathrm{O}(l) \longrightarrow \mathrm{H}_{2} \mathrm{O}(g)$ at $298 \mathrm{~K}$ and 1.0 atm, $\Delta H$ is more positive than $\Delta E$ by $2.5 \mathrm{~kJ} / \mathrm{mol}$. What does the $2.5 \mathrm{~kJ} / \mathrm{mol}$ quantity represent?

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