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Calculate the enthalpy of formation of c...

Calculate the enthalpy of formation of carbon monoxide (CO) from the following data
(i) `C_((s))+O_(2(g))rarrCO_(2(g)),Delta_(r)H^(0)=-393.5KJ" mole"^(-1)`
(ii) `CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g)),Delta_(r)H^(0)=-283.5KJ" mole"^(-1)`

Text Solution

Verified by Experts

We aim at` : C(s) +(1)/(2) O_(2)(g) rarr CO(g) , Delta_(f) H^(@) = ?`
Subtracting eqn. (ii) fromeqn. (i), we get
`C(s) +(1)/(2) O_(2)(g) - CO(g) rarr0, Delta_(r) H^(@) = - 393.5 - (- 283.0) = - 110.5 kJ mol^(-1)`
or `C(s) +(1)/(2) O_(2)(g) rarr CO (g) , Delta _(r) H^(@) = - 110.5 kJ`
`:. ` Heat of formation of CO is `: Delta _(f) H^(@) = - 110.5 kJ mol^(-1)`
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