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For the reaction C((s))+O(2(g)) rarr CO(...

For the reaction `C_((s))+O_(2(g)) rarr CO_(2(g)), Delta H_(1)=-394" KJ mol"^(-1)`.
`2CO_((g))+O_(2(g)) rarr 2CO_(2), Delta H_(2)=-569 KJ, Delta H` for formation of CO is

A

`+ 109.9" KJ mol"^(-1)`

B

`-109.5" KJ mol"^(-1)`

C

`-165.9" KJ mol"^(-1)`

D

`+165.0" KJ mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Formation of `CO_((g))" is "C_((s))+(1)/(2)O_(2(g))rarr CO_((g)) Delta H=?`
This equation can be obtained by
equation (i) `-(1)/(2) xx` equation (ii)
`therefore Delta H_(f) = Delta H_(1)-(1)/(2) xx Delta H_(2)`
`=-394 -(1)/(2) xx -569 =-394 + 284.5 =109.5`
`therefore Delta H_(f)=-109.5 kJ`
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