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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)`

Text Solution

Verified by Experts

The correct Answer is:
B
`epsilon_(H-H) = x_(1) , epsilon_(O = O) = x_(2) , epsilon_(O-H) = x_(3)`
`Delta_("vap") H_(H_2O)^(Theta) = x_(4)`
`H_(2)(g) + 1/2 O_(2)(g) rarr H_(2)O(l)`
`Delta_(C )H^(Theta) = epsilon_(H - H) + (epsilon_(O = O))/(2) - 2 xx epsilon_(O - H) - Delta_(vap_ H^(Theta) = x_(1) + (x_2)/(2) - 2x_(3) - x_(4)`
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