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For the complete combustion of ethanol, ...

For the complete combustion of ethanol, `C_(2)H_(5)OH(l)+3O_(2)(g)rarr2CO_(2)(g)+3H_(2)O(l)` the amount of heat produced as measured in bomb calorimeter is `1364.47KJ mol^(-1)` at `25^(@)C` . Assuming ideality, the enthalpy of combustion, `DeltaH_(C)` , for the reaction will be
`[R=8.314JK^(-1)mol^(-1)]`

A

`-1366.95 KJ mol^(-1)`

B

`-1361.95KJ mol^(-1)`

C

`-1460.50 KJ mol^(-1)`

D

`-1350.50 KJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`C_(2)H_(5)OH(l)+3O_(2)(g)rarr 2CO_(2)(g)+ 3H_(2)O(l)`
`DeltaU =- 1364.47 KJ/mol`.
`DeltaH = DeltaU + Deltan_(g)RT`
`Deltan_(g)=-1`
`DeltaH=-1364.47 - 2.6.47 + [(-1xx8.314 xx 298)/(1000)]`
`=-1364.47 - 2.4776 =-1366.94 KJ//mol`.
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