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The molar enthalpies of combustion of C(...

The molar enthalpies of combustion of `C_(2)H_(2)(g), C("graphite")` and `H_(2)(g)`are `-1300,-394`, and `-286 kJ mol^(-1)`, respectively. The standard enthalpy of formation of `C_(2)H_(2)(g)` is

A

`-226kJmol^(-1)`

B

`-626kJmol^(-1)`

C

`226kJmol^(-1)`

D

`626kJmol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`2C+H_(2)rarrC_(2)H_(2),DeltaH=H_(R)-H_(P)`
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