`C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-94` kcal
`2CO(g)+O_(2)to2CO_(2),DeltaH=-135.2` kcal
The heat of formation of `CO(g)` is

Options

A. `-26.4` kcal
B. 41.2 kcal
C. 26.4 kcal
D. 229.2 kcal

Answer

A

Explanation

`2CO(g)+O_(2)(g) to 2CO_(2)(g),DeltaH=-135.2kcal`
(I) `CO_(2)(g)toCO(g)+(1)/(2)O_(2)(g),DeltaH=(135*2)/(2)` kcal
(II) `C(s)+O_(2)(g)toCO_(2)(g),DeltaH=-94kcal`
Required equation,
`C(s)+(1)/(2)O_(2)(g) to CO(g),`
On adding eqs. (I) and (II)
`C(s)+(1)/(2)O_(2)(g) to CO(g),DeltaH=-26.4kcal`