Use Hess's law to calculate enthalpy change. Given the following two reactions: (1) Fe(s) + Cl₂(g) →FeCl₂(s) (2) Mg(s) + Cl₂(g) MgCl₂(s) calculate the enthalpy change for the following reaction: (3) FeCl₂(s) + Mg(s) Fe(s) + MgCl₂(s) AH(3) AH(1) = -341.8 kJ AH(2)=-641.3 kJ kJ

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