Suppose 150.0 mL of 0.50 M HCl and 150.0 mL of 0.50 M NaOH, both initially at 24.0°C, are mixed in a thermos flask. When the reaction is complete, the temperature is 27.4°C. Assuming that the solutions have the same heat capacity as pure water, compute the heat released (in kJ).

Answer 1

q = mass water x specific heat water x (Tfinal-Tinitial).
mass water is 300 mL = 300 g