1.

The heats of combustion of carbon and carbon monoxide are - 393.5 and -283.5 KJ mol^(-1), respectively. The heat of formation (in kJ) of carbon monoxide per mole is

Answer»

676.5
`-676.5`
`-110.5`
110.5

Solution :`C(s)+O_(2)(G)rarrCO_(2)(g), DeltaH=-393.5 kJ//mol`
`CO(g)+(1)/(2)O_(2)(g)rarrCO_(2)(g) , DeltaH=-283.5 kJ//mol`
`C(s)+(1)/(2)O_(2)(g)rarrCO(g) , DeltaH=-393.5+283.5 kJ//mol=-110 kJ//mol`


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