Wayne wants to know how much heat an ice pack removes from his sprained knee. He places 50 g of ammonium nitrate (NH4NO3) in a reaction vessel surrounded with 200 mL of water. He records that the initial temperature of the water is 22C. He then adds 40 g of Barium hydroxide [Ba(OH)2] to the reaction vessel. The temperature of the water begins to drop until it reaches 17C.

How much heat was transferred to the water? How much heat was lost from the system; how do you know this?