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The value of enthalpy change (DeltaH) fo...

The value of enthalpy change (`DeltaH`) for the reaction
`C_2H_5OH(l) + 3O_2(g) to 2CO_2(g) +3H_2O(l)`
at `27^@C` is `-1366.5 kJ mol^(-1)`. The value of internal energy change for the above reaction at this temperature will be

A

`1369.0` KJ

B

`-1364.0`KJ

C

`-1361.5 KJ`

D

`-1371.5 ` KJ

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(2)H_(5)OH(l)+3O_(2)(g) rarr 2CO_(2)(g)+3H_(2)O(l)`
`Deltan_(g)=2-3 =-1`
`DeltaU = DeltaH - Deltan_(g)RT`
`" "=-1366.5 -(-1)xx(8.312)/(10^(3))xx 300`
`" =-1366.5 + 0.8314xx3 =- 1364 KJ`
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