The reaction in which `DeltaHgtDeltaU` is

Options

A. `N_(2(g)) + O_(2(g)) to 2NO_(g)`
B. `CaCO_(3(s)) to CaO_(s) + CO_(2(g))`
C. `N_(2(g)) + 3H_(2(g)) to 2NH_(3(g))`
D. `CH_(4(g)) + 2O_(2(g)) to CO_(2(g)) + 2H_(2)O_((l))`

Answer

B

Explanation

(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`