A student mixed 75.0 mL of water containing 0.75 mol HCl at 25�C with 75.0 mL of water containing 0.75 mol of NaOH at 25�C in a foam cup calorimeter. The temperature of the resulting solution increased to 35�C. How much heat in kilojoules was released by this reaction?

Question

Cwater � 4.18 J/gp�C

Answer 1

You had 150 mL water and I suppose the density is 1.0 g/mL so this is 150 g.
q = heat released = mass water x specific heat H2O x (Tfinal-Tinitial)
If you use grams and 4.18 J/g*c, the answer will come out in joules and you will need to convert to kJ.