April 25, 2015

Homework Help: Chemistry

Posted by Anonymous on Saturday, February 21, 2009 at 9:15pm.

The molar heat of reaction, H rxn , for the reaction of

Ca(s) + 2H+(aq)-> Ca2+(aq) + H2(g)

was found to be -550kJ/mol

The change Hrxn , for the reaction of

CaO(s) + 2H+(aq)-> Ca2+(aq) + H2O(l)

was found to be -189kJ/mol

Based on these results if the formation of water is -280kJ/mol What is the change in heat formation for CaO (s) ______ kJ/mol

I was thinking of doing Hess's Law but I am not really sure where to go about this problem.

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