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Q.

The standard enthalpies of formation of H2O2(l) and H2O (l) are-187.8kj. mole-1and -285.8kj.mole-1mole− − respectively. The Ho for the decomposition of one mole ofH2O2(l) TO H2O(l) and O2(g) is

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a

-473.6kJ.mole-1

b

+473.6kJ.mole-1

c

+187.8kJ.mole-1

d

-98.0kJ.mole-1

answer is B.

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Detailed Solution

Standard enthalpy formation of H2O2 H=-187.8kJ

Standard enthalpy formation of H2O2H2O+12O2

Hr=Hf,products-Hf, Reactants

-285.8kJ+12(O)-(-187.8kJ) =98kj.mole-1

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