MCQ
For which of the following reactions, $\Delta H$ is equal to $\Delta U$ ?
- A${N_2}(g) + 3{H_2}(g) \to 2N{H_3}(g)$
- ✓$2HI(g) \to H_2(g) + I_2(g)$
- C$2SO_2 (g) + O_2 (g) \to 2SO_3 (g)$
- D$2NO_2 (g) \to N_2O_4 (g)$
✓
Answer
Correct option: B.
$2HI(g) \to H_2(g) + I_2(g)$
b
$\Delta H = \Delta U + \Delta {n_g}RT$
$\Delta H = \Delta U + \Delta {n_g}RT$
$2HI(g) \to {H_2}(g) + {I_2}(g);\Delta {n_g} = (1 + 1) - 2 = 0$
$\therefore \,\Delta H = \Delta U + 0$
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