Question

For the combustion reaction at $298 K,$
$H_{2}\left(g\right)+1/2O_{2}\left(g\right)\to H_{2}O\left(l\right)$
Which o f the following altemative (s) is/are correct?

• A. $\Delta H =\Delta E$
• B. $\Delta H >\Delta E$
• C. $\Delta H <\Delta E$
• D. $\Delta H$ & $\Delta E$ have no relation with each other

Answer 1

Answer: (C)

$\Delta n=-1/2-1=-3/2$
Since, $\Delta n<0$
$\therefore \Delta H is<\Delta E$