`Delta_(f)U^(c-)` of formation of `CH_(4)(g)` at certain temperature is`-393kJ mol^(-1)` . Thevalue of `Delta_(f)H^(c-)` isA. zeroB. ` lt Delta_(f)U^(c-)`C. `gt Delta_(f)U^(c-)`D. equalto `Delta_(f)U^(c-)`

`Delta_(f)U^(c-)` of formation of `CH_(4)(g)` at certain temperature i

1.	`Delta_(f)U^(c-)` of formation of `CH_(4)(g)` at certain temperature is`-393kJ mol^(-1)` . Thevalue of `Delta_(f)H^(c-)` isA. zeroB. ` lt Delta_(f)U^(c-)`C. `gt Delta_(f)U^(c-)`D. equalto `Delta_(f)U^(c-)`
Answer» Correct Answer - b `CH_(4)(g) + 2O_(2)(g) rarr CO_(2)(g) + 2H_(2)O(l)` `Deltan_(g) = ( n_(p)-n_(r))_(g)=1-3= -2` `Delta_(f)H^(@) =Delta_(f)U^(@) + Deltan_(g) RT` As `Deltan_(g) = - 2 , Delta_(f)H^(@) lt Delta_(f) U^(@)` .

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`Delta_(f)U^(c-)` of formation of `CH_(4)(g)` at certain temperature is`-393kJ mol^(-1)` . Thevalue of `Delta_(f)H^(c-)` isA. zeroB. ` lt Delta_(f)U^(c-)`C. `gt Delta_(f)U^(c-)`D. equalto `Delta_(f)U^(c-)`

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