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If x(1) , x(2) and x(3) are enthalpies o...

If `x_(1)` , `x_(2)` and `x_(3)` are enthalpies of `H-H` , `O=O` and `O-H` bonds respective, and `x_(4)` is the enthaply of vaporisation of water, estimate the standard enthalpy opf combustion of hydrogen.

A

`x_1+x_2/2-2x_3+x_4`

B

`x_1+x_2/2-2x_3-x_4`

C

`x_1+x_2/2-x_3+x_4`

D

`2x_3-x_1-x_2/2-x_4`

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The correct Answer is:
B
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