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The enthalpies of combustion of carbon a...

The enthalpies of combustion of carbon and carbon monoxide are `-393.5` and `-283.0 kJ mol^(-1)` respectively. The enthalpy of formation of carbon monoxide is :

A

`-676.5 kJ`

B

110.5 kJ

C

`-110.5 kJ`

D

676.5 kJ

Text Solution

Verified by Experts

The correct Answer is:
C
(i) `C + (1)/(2)O_(2) rarr CO_(2), Delta H = - 393.5 kJ`
(ii) `CO + (1)/(2)O_(2) rarr CO_(2), Delta H = - 283.0 kJ`
`C + (1)/(2)O_(2) rarr CO, Delta H = ?`
Subtract equation (ii) from (i),
`C + (1)/(2)O_(2) rarr CO, Delta H = - 110.5 kJ`
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