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Q.

The standard enthalpies of formation of Al2O3 and CaO are −1675 kJ mol−1 and −635 kJ mol−1 respectively. For the reaction3CaO+2Al→3Ca+Al2O3 the standard reaction enthalpy ΔrH0=_____kJ.(Round off to the Nearest Integer)

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answer is 230.

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Detailed Solution

ΔHfo=ΔHfAl2O3o−3Δ0Hf(CaO)=(−1675)−3(−635) =230.

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