Question

A 3.50 g sample of KOH (at 22.3 °C) is dissolved in a 5.50 M HCl solution in a coffee cup calorimeter. The total volume of the resulting solution is 250 mL and its temperature rises from the initial value of 22.3 °C (before KOH addition) to 37.8 °C. Calculate ΔH (in kJ/mol) of the dissolution and neutralization of KOH.

Assume that the density of the solution is 1.00 g/mL and that the specific heat of the solution is the same as that for water, 4.184 J/(g·K).

A.) −10.8 kJ/mol

B.)+104.7 kJ/mol

C.) −259.6 kJ/mol

D.) −16.2 kJ/mol

E.) +16.2 kJ/mol