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

ost-1 ab Questions 1. If a commercial cold pack contains 40, g of ammonium nitrate, caleulate the kJ of heat energy transferred ( q yam when the entire cold pack is activated. By how much will the instant cold pack's solution decrease (AT of the surroundings)? (Hint; use the energy change you calculated at the end of the lab as a starting point.) 2. Circle the correct choices in the following sentence to summarize the heat change that occurs when a commercial cold pack is activated: When the white solid in the commereial cold pack dissolves in water, the pack feels (hoteold) because the temperafure of the solution (increases/decreases). Energy is (released tolabsorbed from) the surroundings during this reaction and the reaction is classified as (endothermic/exothermic)