Trial #1

30.0 mL of water

initial temp of water was 24C

mass of NH4NO3 was 5.0g

lowest temp of water reached 14C

Trial #2

30 mL of water

initial temp of water was 23C

mass of NH4NO3 was 5.0g

lowest temp of water reached was 13C

10. Calculate the energy change in units of kilojoules per mole of solid (system) for the cold pack solid dissolving in water. (**Notice you are now dealing with the system. Watch your sign!) Trial 1