Data Table for the Laboratory Activity Mass of Mass of Mixture KNO3 H₂O Temperature of Recrystallization (°C) (g) (g) 1 4.0 10.0 24 2 5.0 32 10.0 45 3 7.5 10.0 4 10.0 10.0 58 Refer to Figure 1 and answer the following Question: Compare the freezing point of mixture 4 at 1.0 atm to the freezing point of water at 1.0 atm. Answer

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Chapter9: Energy And Chemistry
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Problem 9.96PAE: 9.96 Most first aid "cold packs" are based on the endothermic dissolution of ammonium nitrate in...
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2
21ww.xnew bojuti ai nom/lo od 1
To omon
Figure 1
Base your answer to the question on the information below and on your knowledge of chemistry. The
In a laboratory activity, each of four different masses of KNO3(s) is placed in a separate test tube that contains 10.0
grams of H₂O at 25°C.
When each sample is first placed in the water, the temperature of the mixture decreases. The mixture in each test tube is
then stirred while it is heated in a hot water bath until all of the KNO3(s) is dissolved. The contents of each test tube are
then cooled to the temperature at which KNO3 crystals first reappear. The procedure is repeated until the recrystallization
temperatures for each mixture are consistent, as shown in the table below.
Data Table for the Laboratory Activity
Mass of Mass of
Temperature of
Recrystallization
Mixture
KNO3
H₂O
(g)
(9)
(°C)
1
4.0
10.0
24
5.0
10.0
32
twoll
wana ban
7.5
10.0
45
4
10.0
10.0
58
Refer to Figure 1 and answer the following Question:
Compare the freezing point of mixture 4 at 1.0 atm to the freezing point of water at 1.0 atm.
Answer
PURE
23
(DE) 10.1
Transcribed Image Text:2 21ww.xnew bojuti ai nom/lo od 1 To omon Figure 1 Base your answer to the question on the information below and on your knowledge of chemistry. The In a laboratory activity, each of four different masses of KNO3(s) is placed in a separate test tube that contains 10.0 grams of H₂O at 25°C. When each sample is first placed in the water, the temperature of the mixture decreases. The mixture in each test tube is then stirred while it is heated in a hot water bath until all of the KNO3(s) is dissolved. The contents of each test tube are then cooled to the temperature at which KNO3 crystals first reappear. The procedure is repeated until the recrystallization temperatures for each mixture are consistent, as shown in the table below. Data Table for the Laboratory Activity Mass of Mass of Temperature of Recrystallization Mixture KNO3 H₂O (g) (9) (°C) 1 4.0 10.0 24 5.0 10.0 32 twoll wana ban 7.5 10.0 45 4 10.0 10.0 58 Refer to Figure 1 and answer the following Question: Compare the freezing point of mixture 4 at 1.0 atm to the freezing point of water at 1.0 atm. Answer PURE 23 (DE) 10.1
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