1.

The reaction in which DeltaHgtDeltaU is

Answer»

`N_(2(g)) + O_(2(g)) to 2NO_(g)`
`CaCO_(3(s)) to CaO_(s) + CO_(2(g))`
`N_(2(g)) + 3H_(2(g)) to 2NH_(3(g))`
`CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_(2)O_((L))`

Solution :(b) As `DeltaH = DeltaU + Deltan_(g)RT`
For the reaction, `CaCO_(3(s)) to CaO_(s)+CO_(2(g))`
`Deltan_(g)=1`
`:. DeltaH gt DeltaU`


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