Heat of precipitation (Find the heat change)

Calculate the heat change when 200 cm3 of 0.5 mol dm-3 calcium chloride, CaCl2  solution  is added to 200 cm3 of 0.5 mol dm-3 sodium carbonate, Na2CO3 solution if the heat of precipitation of calcium carbonate, CaCO3 is  +12.6 kJ mol-1
[ Specific heat capacity of solution : 4.2 J g-1 0C-1 . Density of solution : 1 g cm-3 ]

(ans: 1.26 kJ)

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