when 1.50 L of 1.00 M Na2So4 solution at 30.0 degrees celcuis is added to 1.50 L of 1.00 M Ba(No3)2 solution at 30.0 degrees celcius in a calorimeter, a white solid forms. The temp of the mixture increases to 42.0 degrees celcius. Assuming that the specific heat capacity of the solution is 6.37J/degree celcius g and the density of the final solution is 2.00 g/mL, calculate the enthalpy change per mole of BaSO4 formed.