We will weigh out 114.2 g of 1m NaSO solution which contains 0.100 mol NaSO in 100.0 g water. this will react with 100.0 g HO to form aproduct mixture consisting of 0.5m NaSO weighing 214.2 g. That heat capacity of the product system is (214.2X4.01) +5=864 J/C eq.5