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The enthalpies of combustion of carbon a...

The enthalpies of combustion of carbon and carbon momoxide are `-390KJ` respectively. The enthalpy of fomation of `CO` in `KJ` is

A

`668`

B

`-12`

C

`-112`

D

`-668`

Text Solution

Verified by Experts

The correct Answer is:
C
`C + O_(2) rarr CO_(2), Delta H = -290 kJ` ....(i)
`CO + (1)/(2) O_(2) rarr CO_(2), Delta H = -278 kJ` ...(2)
By eq. (1) and eq. (2), we get
`C + (1)/(2) O_(2) rarr CO, Delta H = -112 kJ`
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