Heat of combustion `DeltaH^(@)` for `C(s),H_(2)(g)` and `CH_(4)(g)` are `94, -68` and `-213Kcal//mol` . Then `DeltaH^(@)` for `C(s)+2H_(2)(g)rarrDeltaCH_(4)(g)` isA. `-17Kcal`B. `111Kcal`C. `-170Kcal`D. `-85Kcal`

Heat of combustion `DeltaH^(@)` for `C(s),H_(2)(g)` and `CH_(4)(g)` ar

1.	Heat of combustion `DeltaH^(@)` for `C(s),H_(2)(g)` and `CH_(4)(g)` are `94, -68` and `-213Kcal//mol` . Then `DeltaH^(@)` for `C(s)+2H_(2)(g)rarrDeltaCH_(4)(g)` isA. `-17Kcal`B. `111Kcal`C. `-170Kcal`D. `-85Kcal`
Answer» Correct Answer - D For reaction, `C(s)+2H_(2)(g)rarrCH_(4)(g),DeltaH^(@)=`? `DeltaH^(@)=-[(Delta_(c)^(0)` of `CH_(2)-(Delta_(c)^(0)` of `C+2xxDeltaH_(c)^(0)` oof `H_(2))]` `C+O_(2)rarrCO_(2),DeltaH=-94Kcal` (i) `2H_(2)+O_(2)rarr2H_(2)O,DeltaH=-68xx2Kcal` (ii) `CH_(4)+2O_(2)rarrCO_(2)+2H_(2)O,DeltaH=-213Kcal` (iii) `"eq". (i)+(ii)-Eq(iii)` `=-[(-213)-(-94+2xx-68)]Kcal//mol` `=-[-213+230]=-17Kcal//mol`

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Heat of combustion `DeltaH^(@)` for `C(s),H_(2)(g)` and `CH_(4)(g)` are `94, -68` and `-213Kcal//mol` . Then `DeltaH^(@)` for `C(s)+2H_(2)(g)rarrDeltaCH_(4)(g)` isA. `-17Kcal`B. `111Kcal`C. `-170Kcal`D. `-85Kcal`

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