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Find the heat of formation of ethyl alco...

Find the heat of formation of ethyl alcohol for following data
`C(s) +O_(2)(g) rarr CO_(2)(g) DeltaH =- 94 kcal`
`H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l), DeltaH =- 68 kcal`
`C_(2)H_(5)OH(l)+3O_(2)(g) rarr 2CO_(2)(g) +3H_(2)O(l) DeltaH =- 327 kcal`

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`2C(s) +3H_(2)(g)+(1)/(2)O_(2)(s) rarr C_(2)H_(5)OH(l) DeltaH = ?`
Given: `C(s) +O_(2)(g) rarr CO_(2)(g) ……..(i)`
`DeltaH_(1) =- 94 kcal`
`H_(2)(s) +(1)/(2)O_(2)(g) rarr H_(2)O(l) ……..(ii)`
`DeltaH_(2) =- 68 kcal`
`C_(2)H_(5)OH (l)+3O_(2)(g) rarr 2CO_(2)(g) +3H_(2)O(l)......(iii)`
`DeltaH_(3) =- 372 kcal`
Operate:
`2(i) +3(ii) `-(iii) to get
`Delta_(f)H = 2(DeltaH_(1))+3(DeltaH_(2)) - DeltaH_(3)`
`=(-94) +3(-68) -(-327) = 65 kcal mol^(-1)`
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