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Given that 2C(s) + 2O(2)(g) rarr 2CO(2...

Given that
`2C(s) + 2O_(2)(g) rarr 2CO_(2)(g) Delta H = -787 kJ`
`H_(2)(g) + (1)/(2)O_(2)(g) rarr H_(2)O(l) Delta H = -286 kJ`
`C_(2)H_(2)(g) + (2) (1)/(2) O_(2)(g) rarr 2CO_(2)(g) + H_(2)O(l)`
`Delta H = -1301 kJ`
Heat of formation of acetylene is :

A

`-1802 kJ`

B

`+1786 kJ`

C

`-180.2 kJ`

D

`+228 kJ`

Text Solution

Verified by Experts

The correct Answer is:
D
Rthe required equation is
`2C + H_(2)(g) rarr C_(2)H_(2)(g)`
Adding eqns. (i) and (ii) and substracting equation (iii)
`Delta H = 228 kJ`
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