A 0.500-L sample of 0.400 M Na_{2}CO_{3} (aq) is added to 0.500 L of 0.400 M Ba(NO _{3})_{2} (aq) in a calorimeter with a total heat capacity equal to 656 J•K ^{–1} at a constant pressure of one bar. The temperature change is +1.25 K. Use these data to calculate the value of ΔH°rxn for the equation:

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