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 vaporization of water, estimate the standard enthalpy of combustion of hydrogen.

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H 2 ( g ) + 1 2 O 2 ( g ) → H 2 O ( l ) …(i) H 2 ( g ) → 2 H ( g ); Δ H = x 1 O 2 ( g ) → 2 O ( g ); Δ H = x 2 H 2 O ( l ) → H 2 O ( g ); Δ H = x 4 H 2 O ( g ) → 2 H ( g ) + O ( g ); Δ H = 2 x 3 Using all four, we (find) (i) x 1 + x 2 2 - x 4 - 2 x 3

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