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How do I calculate the ΔH of Mg(s) + HCl(l) -> MgCl2(aq) + H2(g)?
Yes, please.
Okay, I have the values. The standard enthalpy of formation for Mg(s) is 0 kJ/mol and for H2(g) is 0 kJ/mol. The standard enthalpy of formation for HCl(l) is -92.3 kJ/mol. Now we can use these values with the enthalpy of formation for MgCl2(aq) that you provided earlier to calculate the ΔH for the reaction. Would you like me to do that for you?