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How do I calculate the ΔH of Mg(s) + HCl(l) -> MgCl2(aq) + H2(g)?
Yes, I remember the enthalpy of formation for MgCl2(aq) is -641.3 kJ/mol.
That's correct! Now we just need to find the enthalpy values for the other reactants and products. Do you know how to find those?