Assume that 100.0 mL of 0.200 M CsOH and 50.0 mL of 0.400 M HCl are mixed in a calorimeter. The solutions start out at 22.50 °C, and the final temperature after reaction is 24.28 °C. The densities of the solutions are all 1.00 g/mL, and the specific heat of the mixture is 4.2J(g . °C).
What is the enthalpy change for the neutralization reaction of 0.020 mol of CsOH in kJ/mol?
Express your answer using two significant figures.