When 1.003 g of NH4NO3 was added to 60 mL of water the temperature dropped by 1.3 oC, from an inital temperature of 21.6 oC to 20.3 oC
What mass of NH4NO3 would be needed to drop the temperature to 2 oC?
Then if 500g of NH4NO3 cost $8.95 what would be the cost of the cold pack?