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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

Verified by Experts

The correct Answer is:
`-2091.32kJ mol^(-1)`
We aim at `: (##PR_CHE_01_XI_C06_E35_010_S01.png" width="80%"> `+ (9)/(2) O_(2)rarr3CO_(2)+3H_(2)O,DeltaH =?`
We are given `: (i) C+O_(2) rarr CO_(2),DeltaH= - 393.5 kJ `
(ii) `H_(2) + (1)/(2) O_(2) rarr H _(2)O, DeltaH = - 285kJ`
(iii) `3C + 3H_(2)rarr CH_(3) - CH = CH_(2),DeltaH= 20.42kJ`
(iv) ` rarrCH_(3)- CH=CH_(2), DeltaH = -33.0 kJ `
3` xx` Eqn. (i) `+3 xx` Eqn. (ii) `+` Eqn (iv) -Eqn. (iii) gives the required result.
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