Potassium nitrate, KNO3KNO3, has a molar mass of 101.1101.1g/mol. In a constant-pressure calorimeter, 44.644.6 g of KNO3KNO3is dissolved in 201201 g of water at 23.00 °C23.00 °C.
KNO3(s)H2O−−→K+(aq)+NO−3(aq)KNO3(s)→H2OK+(aq)+NO3−(aq)
The temperature of the resulting solution decreases to 17.70°C17.70 °C. Assume that the resulting solution has the samespecific heat as water, 4.184 J/(g⋅°C)4.184 J/(g·°C), and thatthere is negligible heat loss to the surroundings.
How much heat was released by the solution?
What is the enthalpy of the reaction?
