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Calculate the enthalpy of formation of `Delta_(f)H` for `C_(2)H_(5)OH` from tabulated data and its heat of combustion as represented by the following equaitons:
i. `H_(2)(g) +(1)/(2)O_(2)(g) rarr H_(2)O(g), DeltaH^(Theta) =- 241.8 kJ mol^(-1)`
ii. `C(s) +O_(2)(g) rarr CO_(2)(g),DeltaH^(Theta) =- 393.5kJ mol^(-1)`
iii. `C_(2)H_(5)OH (l) +3O_(2)(g) rarr 3H_(2)O(g) + 2CO_(2)(g), DeltaH^(Theta) =- 1234.7kJ mol^(-1)`
a. `-2747.1 kJ mol^(-1)` b. `-277.7 kJ mol^(-1)`
c. `277.7 kJ mol^(-1)` d. `2747.1 kJ mol^(-1)`

A

`-2747.1 kJ mol^(-)`

B

`277.7 kJ mol^(-)`

C

`-277.7 kJ mol^(-)`

D

`2747.1 kJ mol^(-1)`

Text Solution

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The correct Answer is:
C
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