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If \( \mathrm{x}_{1}, \mathrm{x}_{2} \) and \( \mathrm{x}_{3} \) are enthalpies of \( \mathrm{H}-\mathrm{H}, \mathrm{O}=\mathrm{O} \) and \( \mathrm{O}-\mathrm{H} \) bonds respectively, and \( \mathrm{x}_{4} \) is the enthalpy of vaporisation of water, estimate the standard enthalpyof combustion of hydrogen
\( P \)
(A) \( x_{1}+\frac{x_{2}}{2}-2 x+x_{4} \)
(B) \( x_{1}+\frac{x_{2}}{2}-2 x_{3}-x_{4} \)
(C) \( x_{1}+\frac{x_{2}}{2}-x_{3}+x_{4} \)
(D) \( 2 x-x-\frac{x_{2}}{2}-x \)
W.
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