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The heats of combustion of carbon hydrog...

The heats of combustion of carbon hydrogen and acetylene are `-394kJ, -286kJ and -1301 kJ` respectively. Calculate heat of formation of `C_(2)H_(2)`

A

621 kJ

B

454kJ

C

`-227` kJ

D

227 kJ

Text Solution

Verified by Experts

The correct Answer is:
D
Reaction for formation of `C_(2)H_(2)` is `2C_((gr)) + H_(2(g)) rarr C_(2) H_(2(g))`
`Delta H` of reaction `= Sigma` Heat of combustion of reactants `- Sigma` Heat of formation of products `Delta H= 2 (-394) + (-286) - (-1301) = 227KJ`
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