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

The value of enthalpy change `(DeltaH)` 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 reactio at this temperature will be

A

`-1371.5 kJ `

B

` - 1369.0 kJ `

C

`- 1364.0 kJ `

D

`- 1361.5 kJ `

Text Solution

Verified by Experts

The correct Answer is:
C
`C_2H_5OH(l) +3 O_2(g) rarr 2 CO_2(g)+3 H_2 O(l).`
`Delta Nn_g =2-3 =-1 `
`Delta U= Delta H- Deltan_g RT`
`= -1366.5 KJ " mol "^(-1)-(-1) xx 8.314 xx 10^(-3)kJ K^(-1) "mol "^(-1)xx 300 K`
`-1366.5+0.8314 xx 3 kJ " mol "^(-1)`
`=-1364 kJ " mol "^(-1)`
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