1.

Given thatC+ O_2 to CO_2 , Delta H^@ = -x kJ 2CO +O_2to 2CO_2, Delta H^@ = -y kJThe heat of formation of carbon monoxide will be

Answer»

`(y - 2x)/(2)`
`y + 2x`
`2x - y`
`(2x- y)/(2)`

Solution :`(1) C + O_2 to CO_2 , Delta H_1^@ = -xkJ`
`(2) 2CO + O_2 to 2CO_2 , Delta H_2^@ = - ykJ`
Desired equation for formation of CO is
`C + 1/2 O_2 to Co`
This equation can be obtained by
eqn(1) `+ 1/2 `(reverse of eqn. (2) i.e.,
`C+ O_2 + CO_2 to CO_2 + CO + 1/2O_2`
` therefore Delta H_f^@ (CO)= -x + 1/2 (+y) = y/2 -x = (y-2x)/(2) kJ`


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