February 25, 2017

Homework Help: Chemistry

Posted by Luc on Sunday, February 21, 2010 at 7:44am.

∆H⁰rxn, for the reaction of Ca(s) + 2H+(aq) -> Ca2+(aq) + H2(g) is -544 kJ/mol.

∆H⁰rxn, for the reaction of CaO(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) is -193 kJ/mol.

Based on these results, what is the ∆Hf for CaO(s) [in kJ/mol] if the heat of formation of water is -286 kJ/mol?

Can someone please help me with this. I calculated all the given information above; however, I have no idea how to connect the dots and answer this question. Thank you!

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