We are asked to determine the ΔH°rxn for the reaction:
Ca(OH)2 + 2 H3AsO4 → Ca(H2AsO4)2 + 2 H2O
We can use the following equation to solve for ΔH˚rxn:
Note that we need to multiply each ΔH˚f by the stoichiometric coefficient since ΔH˚f is in kJ/mol.
Also, note that ΔH˚f for elements in their standard state is 0.
Given the data in the table on the right, the ΔH°rxn for the reaction:
Ca(OH)2 + 2 H3AsO4 → Ca(H2AsO4)2 + 2 H2O is ___________ kJ.
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.