When 2.950 g of AX (s) dissolves in 100.0 g of water in a coffee-cup calorimeter the temperature rises from 22.0 oC to 31.7 oC. Calculate the enthalpy change (in kJ/mol) for the solution process
AX (s) --> A+ (aq) + X- (aq)
Assumptions for this calculation:
The specific heat of the solution is the same as that of pure water (4.18 J/ g-K).
The density of water = 1.000 g/mL. The liquid's final volume is not changed by adding the solid.
The calorimeter loses only a negligible quantity of heat.
The formula weight of AX = 52.7398 g/mol. Make sure you include the correct sign for the enthalpy change. The units are kJ/mol.