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Heat of formation of H(2)O((l)), CO(2(g)...

Heat of formation of `H_(2)O_((l)), CO_(2(g)) and C_(2)H_(4(g))` are -285.0, -399.0 and 69.9 kJ/mole respectively. The heat of combustion of ethylene is

A

-143.79 kJ

B

-1437.9 kJ

C

-1.4379 kJ

D

-14.379 kJ

Text Solution

Verified by Experts

The correct Answer is:
B
`C_(2)H_(4(g))+O_(2(g)) rarr 2CO_(2(g))+2H_(2)O_((g))`
`Delta H = Sigma H_(P) - Sigma H_(R) =(-2xx285+-2xx399)-69.9`
`=-1368-69.9 =-1437.9 kJ`
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