1.

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

Answer»

`N_(2)(G) + 3 H_(2)(g) rarr 2 NH_(3)(g)`
`CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l)`
`PCl_(5)(g) rarr PCl_(3)(g) + Cl_(2)(g)`
`HCl(aq) + NaOH(aq) rarr NACL(aq) + H_(2)O(aq)`

Solution :`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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