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Example^ Section 3: Data Argument: Salt Temperature Changes and Costs: Compound NH 4 Cl NH 4 NO 3 NaS 2 O 3 *5H 2 O MgSO 4 *7H 2 O TInitial( ℃ ) 23.1 22.0 24.0 23.1 TFinal (°C) 21.8 20.5 23.0 22.7 Δ T (°C) -1.3 -1.5 -0.9 -0.4 Volume of water (mL) 60. 58. 61. 61. Q water (J) -331.474 -369.93 -233.244 -103.76 Q soln (J) +331.474 +369.93 +233.244 +103.76 grams salt (g) 1.000 1.000 1.000 1.000 Cost/kg 17.73 29.6 57.9 25.3 Cost/IcePack $0.011 $0.012 $0.019 $0.025 Based on the data collected during this laboratory, ammonium chloride (NH4Cl) is the most cost-effective salt on which to mass produce a cold pack. Ammonium chloride is not the most temperature sensitive compound when reacting with water compared to compounds such as ammonium nitrate (NH4NO3). However, when evaluated by its cost per kilogram, ammonium chloride was the least expensive. Based on this data, it appears that ammonium chloride is the most economical salt to use for making a cold pack. Since the data was collected carefully and