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Given that: 2C(s)+O(2)(g)to2CO(2)(g)" ...

Given that:
`2C(s)+O_(2)(g)to2CO_(2)(g)" "(DeltaH=-787kJ)` . . . (i)
`H_(2)(g)+1//2O_(2)(g)toH_(2)O(l)" "(DeltaH=-286kJ)` . . . (ii)
`C_(2)H_(2)+2(1)/(2)O_(2)(g)to2CO_(2)(g)+H_(2)O(l)" "(DeltaH=-1310kJ)` . . .(iii)
The heat of formation of acetylene is:

A

`-1802kJ" " mol^(-1)`

B

`+1802kJ" "mol^(-1)`

C

`+237kJ" "mol^(-1)`

D

`-800kJ" "mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
Required equation is
`2C(s)+H_(2)(g)toC_(2)H_(2)(g)`
It can be adding eqs. (i) and (ii) and then subtracting eq. (iii) from it
Heat of formation of acetylene
`=(-787)+(-286)-(-1310)`
`=+237kJ" "mol^(-1)`
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