1.

Heats of combustion (DeltaH^(@)) for C(s), H_(2)(g) and CH_(4)(g)are -94, -68 and -213 kcal/mol. Respectively. The value of DeltaH^(@) for the reaction, C(s)+2H_(2)(g)rarrCH_(4)(g) is

Answer»

`- 85 KCAL`
`- 111 kcal`
`-17 kcal`
`- 170 kcal`

Solution :`C_((s))+2H_(2(g))rarrCH_(4(g))"....(i)"`
`C_((s))+O_(2(g))rarrCO_(2(g))DeltaH=-94 " kcal mol"^(-1)"....(ii)"`
`H_(2(g))+(1)/(2)O_(2(g))rarrH_(2)O_((l))DeltaH=-68 " kcal mol"^(-1)"....(iii)"`
`CH_(4)+3//2O_(2)rarrCO_(2)+2H_(2)O`
`DeltaH=-213 " kcal mol"^(-1)"....(iv)"`


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