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Magnesium chloride hexahydrate (MgCl2·6H2O) can be prepared by the following reaction: MgO(s) + 2HCl(aq) + 5H2O(l)...

Magnesium chloride hexahydrate (MgCl2·6H2O) can be prepared by the following reaction: MgO(s) + 2HCl(aq) + 5H2O(l) ⟶ MgCl2∙6H2O(s) ΔH°rxn = -133 kJ/mol What is the standard molar enthalpy of formation of magnesium chloride hexahydrate in kJ/mol?

ΔH°f(MgO)=-602 kJ/mol

ΔH°f(HCl)=-167 kJ/mol

ΔH°f(H2O)=-286 kJ/mol

a) -1444 b) -133 c) -2499

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