A 0.351 g sample of solid RbBr (s) is dissolved in 191 mL of water in a coffee cup calorimeter. Once all of the RbBr (s) is dissolved in the water, the final temperature of the solution is found to be 12.69C. If the initial temperature of the water in the calorimeter was 20.89 C, calculate the calorimeter constant (in J/K) for the coffee cup calorimeter. Report your answer to three significant figures.

The heat of solvation of RbBr (s) is 21.88 kJ/mol.