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Use the graph you drew for NH4Cl to determine the amount of salt needed to make a chemical cold pack. Assume using 100 g (100 mL) of water. The temperature should go down to 3.0 °C from a room temperature of 25 °C. Show all calculations. for the slope from graph: y=0.4327x-10.859

Use the graph you drew for NH4Cl to determine the amount of salt needed to make a chemical cold pack. Assume using 100 g (100 mL) of water. The temperature should go down to 3.0 °C from a room temperature of 25 °C. Show all calculations. for the slope from graph: y=0.4327x-10.859

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Use the graph you drew for NH4Cl to determine the amount of salt needed to make a chemical cold pack. Assume using 100 g (100 mL) of water. The temperature should go down to 3.0 °C from a room temperature of 25 °C. Show all calculations.

for the slope from graph: y=0.4327x-10.859 

 

Mass of water Mass of salt Moles of salt Initial Temperature Final Temperature Change in Temperature Heat released/absorb ed by water Heat released/absorb ed by the calorimeter 5g CaCl2 100.0g 10g CaCl2 100.0g 13°C 5.06g 10.06g 15.0g 0.045m 0.091m 0.135m ol ol ol 13°C℃ 20.2°C 24.9°C 15g CaCl2 100.0g 13°C -30.1J -49.7J 26.5°C 5g NH4CI 100.0g 5.10g 0.09534m ol 13°C 10.1°C 7.2°C 11.9°C 13.5°C -2.9°C -3009.6J -4974.2J -5643.0J 1212.2J -56.43J 12.12J 10g NH4CI 100.0g 10.08g 0.188mol 0.281mol 13°C 7°C -6°C 15g NH4CI 100.0g 15.04g 25.1J 13°C 8.4°C -4.6°C 2508J 1922.8J 19.23J
Transcribed Image Text:Mass of water Mass of salt Moles of salt Initial Temperature Final Temperature Change in Temperature Heat released/absorb ed by water Heat released/absorb ed by the calorimeter 5g CaCl2 100.0g 10g CaCl2 100.0g 13°C 5.06g 10.06g 15.0g 0.045m 0.091m 0.135m ol ol ol 13°C℃ 20.2°C 24.9°C 15g CaCl2 100.0g 13°C -30.1J -49.7J 26.5°C 5g NH4CI 100.0g 5.10g 0.09534m ol 13°C 10.1°C 7.2°C 11.9°C 13.5°C -2.9°C -3009.6J -4974.2J -5643.0J 1212.2J -56.43J 12.12J 10g NH4CI 100.0g 10.08g 0.188mol 0.281mol 13°C 7°C -6°C 15g NH4CI 100.0g 15.04g 25.1J 13°C 8.4°C -4.6°C 2508J 1922.8J 19.23J
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