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Calculate the heat of formation (DeltaH...

Calculate the heat of formation ` (DeltaH)` of CO from the following data.
(I) `C_(graph ite)+2H_(2)(g)toCH_(4)(g)," " DeltaH=-94kcal` (II) `CO(g)+(1)/(2)O_(2)toCO_(2)(g)," "DeltaH=-68kcal`

A

`-1.3`

B

`-26`

C

`-162`

D

`-82`

Text Solution

Verified by Experts

The correct Answer is:
B
(I)`C_(graph ite)+O_(2)toCO_(2)(g),"""""Delta=-94kcal`
(II)`CO(g)+(1)/(2)O_(2)(g)toCO_(2)(g),""DeltaH=-68kcal`
In the order to find heat of formation of CO,Add equation (I)and (II) (I)`C_(graph ite)+O_(2)toCO_(2)(g),Delta=-94kcalunderline(CO(g))toCO+(1)/(2)O_(2)(g),DeltaH=-68kcal`
`C+(1)/(2)O_(2)toCO,"""""DeltaH=-26kcal`
`DeltaH=-26kcal`
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