First slide

Relation between Delta H and Delta U

Question

For which of the following reaction, $∆ H = ∆ E + 2 RT$ ?

Easy

A

$2 {SO}_{2} (g) + O_{2} (g) \to 2 {SO}_{3} (g)$
B

${NH}_{4} HS (s) \to {NH}_{3} (g) + H_{2} S (g)$
C

$N_{2} (g) + O_{2} (g) \to 2 NO (g)$
D

${PCl}_{5} (g) \to {PCl}_{3} (g) + {Cl}_{2} (g)$

Solution

$∆ H = ∆ E + ∆ nRT; ∆ n = n_{P} (g) - n_{R} (g); In option 2, ∆ n = 2 - 0 = 2; ∆ H = ∆ E + 2 RT;$

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