JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
For which of the following reactions, \(\Delta H\) is equal to \(\Delta U\) ?
- A \({N_2}(g) + 3{H_2}(g) \to 2N{H_3}(g)\)
- B \(2HI(g) \to H_2(g) + I_2(g)\)
- C \(2SO_2 (g) + O_2 (g) \to 2SO_3 (g)\)
- D \(2NO_2 (g) \to N_2O_4 (g)\)
Answer & Solution
Correct Answer
(B) \(2HI(g) \to H_2(g) + I_2(g)\)
Step-by-step Solution
Detailed explanation
\(\Delta H = \Delta U + \Delta {n_g}RT\) \(2HI(g) \to {H_2}(g) + {I_2}(g);\Delta {n_g} = (1 + 1) - 2 = 0\) \(\therefore \,\Delta H = \Delta U + 0\)
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