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

Given that:
i. `C(s) + O_(2)(g) rarr CO_(2)(g) , DeltaH =- 94.05 kcal`
ii. `H_(2)(g) +(1)/(2) O_(2)(g) rarr H_(2)O(l), DeltaH =- 68.32 kcal`
iii. `C_(2)H_(2)(g) +(5)/(2) O_(2)(g) rarr 2CO_(2)(g) +H_(2)O(l),DeltaH =- 310.62 kcal`
The heat of formation fo acetylene is

A

`-1802 kJ`

B

`+1802 kJ`

C

`-800 kJ`

D

`+228 kJ`

Text Solution

Verified by Experts

Required equation is:
`2C(s) + H_(2)(g) rarr C_(2)H_(2)(g)`
`2 xx (i) +(ii) - (iii)` gives
`DeltaH = 2 xx (-94.05) - 68.32 -(-310.62)`
`=- 188.1 - 68.32 + 310.62`
`=- 54.2 kcal`
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