If $x_{1}, x_{2}$ and $x_{3}$ are enthalpies of $H - H, O = O$ and $O - H$ bonds respectively, and $x_{4}$ is the enthalpy of vaporisation of water, estimate the standard enthalpy of combustion of hydrogen.

x_{1} + \frac{x_{2}}{2} - 2 x_{3} + x_{4}

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x_{1} + \frac{x_{2}}{2} - 2 x_{3} - x_{4}

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x_{1} + \frac{x_{2}}{2} - x_{3} + x_{4}

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2 x_{1} - x_{1} - \frac{x_{2}}{2} - x_{4}

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Solution

The correct option is B $x_{1} + \frac{x_{2}}{2} - 2 x_{3} - x_{4}$
As we know,
The heat of reaction = bond energy of reactant - bond energy of the product

$H_{2} (g) + 1 / 2 O_{2} (g) \to H_{2} O (g)$

so standard enthalpy of combustion of hydrogen = $x_{1} + \frac{x_{2}}{2} - 2 x_{3} - x_{4}$

Hence, the correct option is $B$

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If x1,x2 and x3 are enthalpies of H−H,O=O and O−H bonds respectively, and x4 is the enthalpy of vaporisation of water, estimate the standard enthalpy of combustion of hydrogen.

The correct option is B x1+x22−2x3−x4As we know,The heat of reaction = bond energy of reactant - bond energy of the productH2(g)+1/2O2(g)→H2O(g)so standard enthalpy of combustion of hydrogen = x1+x22−2x3−x4Hence, the correct option is B

If $x_{1}, x_{2}$ and $x_{3}$ are enthalpies of $H - H, O = O$ and $O - H$ bonds respectively, and $x_{4}$ is the enthalpy of vaporisation of water, estimate the standard enthalpy of combustion of hydrogen.