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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

`110.5 kJ`

B

`676.5 KJ`

C

`-676.5 KJ`

D

`-110.5 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
`C(s) + O_(2)(g) rarr CO_(2) , DeltaH = -393.5 kJ mol^(-1) " ""…."(i)`
`CO(g) + (1)/(2)O_(2)(g) rarr CO_(2)(g), DeltaH = - 283 "KJmol"^(-1)" ""…."(ii)`
On subraction equation (2) from equation (1) , we get `C(s) + O_(2)(g) rarr CO(g), DeltaH = -110.5 "KJ mol"^(-1).`
The enthalpy of formation of carbon monoxide per mole `=-110.5 "KJ mol"^(-1)`
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