Delta_(f)U^(c-) of formationof CH_(4)(g) at certaintemperature is-393kJ mol^(-1) . Thevalue of Delta_(f)H^(c-) is

Delta_(f)U^(c-) of formationof CH_(4)(g) at certaintemperature is-393k

1.	Delta_(f)U^(c-) of formationof CH_(4)(g) at certaintemperature is-393kJ mol^(-1) . Thevalue of Delta_(f)H^(c-) is
Answer» zero ` lt Delta_(f)U^(C-)` `GT Delta_(f)U^(c-)` equalto `Delta_(f)U^(c-)` Solution :`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^(@)` .