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100 ml of a 0. 300 m solution of agno3 reacts with 100 ml of a 0. 300 m solution of hcl in a coffee-cup calorimeter and the temperature rises from 21. 80 °c to 23. 20 °c. Assuming the density and specific heat of the resulting solution is 1. 00 g/ml and 4. 18 j/g ∙ °c, what is the mass of the reaction solution?.