Standard heats of formation for reactants and products in the reaction below are provided. 2 HA(aq) + MX2(aq) → MA2(aq) + 2 HX(l) Substance ΔHf° (kJ/mol) HA(aq) 280.623 HX(l) 100.27 MA2(aq) 131.46 MX2(aq) -131.718 What is the standard enthalpy of reaction, in kJ? Report your answer to three digits after the decimal.