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From the following data, calculate the e...

From the following data, calculate the enthalpy change for the combustion of cyclopropane at `298K`. The enthalpy of formation of `CO_(2(g)),H_(2)O_((l))` and `Propen e_((g))` are `-393,-285.8` and ` 20.42 kJ mol^(-1)` respectively. The enthalpy of isomerisation of cyclopropane to propene is `-33.0kJ mol^(-1)`

Text Solution

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`C_(s) + O_(2) to CO_(2)(g), DeltaH_(1) = -393.5` kJ ……….(1)
`H_(2)(g) + 1/2O_(2)(g) to H_(2)O(l), DeltaH_(2) = -285.8` kJ………….(2)
`3C(s) + 3H_(2)(g) to C_(3)H_(6), DeltaH_(3) = 20.42 kJ`……….(3)

`DeltaH = 3DeltaH_(1) + 3DeltaH_(2) - DeltaH_(3) + DeltaH_(4)`
`=3 xx (-393.5) + 3 xx (-285.3) - 20.42 -33`
`=-2091.31` kJ
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