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if enthalpies of formatuon of C(2)H(4)(g...

if enthalpies of formatuon of `C_(2)H_(4)(g),CO_(2)(g) and H_(2)O(l)at 250^(@)and 1` atm pressure be 52 ,-394 and `-286 kJ mol ^(-1)` respectively,the enthalpy of combustion of `C_(2) H_(4)(g)`will be

A

`1412 kJ mol ^(-1)`

B

`-1412 kJ mol ^(-1)`

C

`+ 141 .2 kJ mol ^(-1)`

D

` -141 .2 kJ mol ^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
b
`C_(2)H_(4)+3O_(2)to 2CO_(2)+2H_(2)O`
`DeltaH("reaction")=[2xxDeltaH_(f)^(@)(CO_(2))+2xxDeltaH_(f)^(@)(H_(2)O)]`
`[DeltaH_(f)^(@)(C_(2)H_(4))+3xxDeltaH_(f)^(@)(O_(2))]`
`[2(-394)+2(286)]-[52+0]= 1412kJ mol^(-1)`
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