For which of the following reactions ΔH is less than ΔE?

Question

For which of the following reactions $\Delta H$ is less than $\Delta E$?

(A) $\mathrm{HCl}_{(a q)}+\mathrm{NaOH}_{(a q)} \longrightarrow \mathrm{NaCl}_{(a q)}+\mathrm{H}_2 \mathrm{O}_{(l)}$

(B) $\mathrm{H}_{2(\mathrm{~g})}+\mathrm{I}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{HI}_{(\mathrm{g})}$

(C) $\mathrm{C}_{(s)}^{(g)}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{CO}_{2(\mathrm{~g})}$

(D) $\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$

Answer 1

ANSWER : $\Delta n=2-4=-2$

$\therefore \Delta H=\Delta E+(-2) R T \text { or, } \Delta H=\Delta E-2 R T$

Hence, $\Delta H<\Delta E$.

So, The correct option will be (D).