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Q.

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

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answer is 230.

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Detailed Solution

Given reaction3CaO+Al→Al2O3+3CaNow, ΔrH0=∑ΔfH0 Products −∑ΔfH0reactannss =[1×(−1675)+3×0]−[3×(−635)+2×0]=+230kJmol−1
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