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The value of enthalpy change (Delta H) f...

The value of enthalpy change `(Delta H)` for the reaction :
`C_(2)H_(5)OH(l) + 3O_(2)(g) rarr 2CO_(2)(g) + 3H_(2)O(l)` at `27^(@)C` is `- 1366.5 kJ mol^(-1)`. The value of internal energy change for the above reaction at the 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
`Delta H = Delta U + Delta n_(g) RT`
or `Delta U = Delta H + Delta n_(g) RT`
`Delta n_(g) = 2 - 3 = -1`
:. `Delta U = - 1366.5 - (- 1) xx 8.3 xx 10^(-3) xx 300`
`= - 1366.5 + 2.490 = - 1364.01 kJ`
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