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To calculate the enthalpy of reaction (∆H°rxn), you need the standard enthalpy of formation (∆H°f) for each reactant and product. The formula is:
∆H°rxn = Σ [∆H°f (products)] - Σ [∆H°f (reactants)]
Please provide the standard enthalpy of formation values for MnCl2, HNO3, Mn(NO3)2, and HCl. Once you have those values, we can plug them into the equation to calculate the enthalpy of reaction.