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For which of the following reactions, De...

For which of the following reactions, `Delta H` is greater than `Delta U` ?

A

`N_(2)(g) + 3 H_(2)(g) rarr 2 NH_(3)(g)`

B

`CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l)`

C

`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`

D

`HCl(aq) + NaOH(aq) rarr NaCl(aq) + H_(2)O(aq)`

Text Solution

Verified by Experts

The correct Answer is:
C
`Delta H = DeltaU +Delta n_(g)` RT. For this reaction,
`Delta n_(g) =2-1=1`
`:. Delta H gt Delta U`
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