Can you help me with this calorimeter problem ?

Question

In a coffee cup calorimeter 100.0g of H2O and 100mL of HCI are mixed. The HCI had an initial temperture of 44.6°C and the water was originally at 24.6°C. After the reaction the temperature of both substances is 31.3°C.

a) Was the reaction exothermic or endothermic. Explain

b) Calculate how much heat the water lost or gained?

Answer 1

a) Dissolution/ionization would be exothermic. Since the temperature of the water rose from 24.6 to 31.3 degrees, heat was given off by the "reaction", thus indicating an exothermic reaction.

b) q = mC∆T = (100.0g)(4.184 J/g/deg)(6.7 deg) = 2803 J = 2800 J (2.80 kJ) of heat gained by the water.