Question

$O_2\left(g\right)+N_2\left(g\right)⟶2NO\left(g\right)$
For this reaction relate $\Delta H$ and $\Delta U$.

• A. $\Delta H$ =$\Delta U$
• B. $\Delta H$ > $\Delta U$
• C. $\Delta H$ < $\Delta U$
• D. None of these

Answer 1

The correct option is A $\Delta H$ =$\Delta U$

As we know,

$\Delta H$ =$\Delta U+\Delta n_{g}RT$

here,

$O_2\left(g\right)+N_2\left(g\right)⟶2NO\left(g\right)$

$\Delta n_g=2-2=0$

so,

$\Delta H$ =$\Delta U+0RT$

$\Delta H$ = $\Delta U$