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The heats of combustion of carbon and ca...

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 :

A

676.5

B

`-676.5`

C

`-110`

D

`110`

Text Solution

Verified by Experts

The correct Answer is:
C
`C + O_(2) rarr CO_(2)" "DeltaH_(1) = -393.5 kJ`.
`CO + 1/2O_(2) rarr CO_(2) Delta H_(2) = -283.5 kJ`
`C + 1/2 O_(2) rarr CO " " Delta H_(3) = ?`
`Delta H_(3) = Delta H_(1) - DeltaH_(2)`.
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