when a student mixes 50 ml of 1.0 M HCL and 50 ml of 1.0M NaOH in a coffee-cup calorimeter, the temperature of the resultant solution increases from 21.0 C to 27.5 C. Calculate the enthalpy change for the reaction in kJ/mol HCL. For this problem, assume that the calorimeter loses only a negligible quantity of heat, the total volume of the solution is 100 ml, the density of the solution is 1.0 g/ml, and its specific heat is 4.18 J/g-K.