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: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section13.7: Colligative Properties Of Solutions
Problem 13.10PSP: The vapor pressure of an aqueous solution of urea. CH4N2O, is 291.2 mmHg at a measured temperature....
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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
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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