all right, I think I've got it after checking with Hess's Law and doing a full solution.
this is what I have come up with: http://imgur.com/a/Cs95f (sorry, I am lazy)
overall, I got a value of -563.7 kJ/mol.
My class touched on Hess's Law for a bit but not enough to make much of an impact on me. I would edited the post above, but it shows no edit button to use. Basically, I am finding the moles of magnesium for molar enthalpy and the heat quality of the HCl for the other part of molar enthalpy and...
Picture to show more clearly: http://i.imgur.com/JmARtQM.png
1. Homework Statement
What is the molar enthalpy of combustion ΔH(c) of magnesium?
Mg(s) + 2HC(aq) → H2(g) + MgCl2(aq)
MgO(s) + 2HCl(aq) → H2O(l) + MgCl2(aq)
m(Mg) = 0.5 g
m(MgO) = 1.0 g
V(HCl) = 100.0 mL
C(HCl) = 1.0 mol/L...