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A. Data Test tube mass + glass + water: 84.74g Test tube mass + glass: 41.93g...

A. Data
Test tube mass + glass + water: 84.74g
Test tube mass + glass: 41.93g
water mass: 42.81g
mass of water in kilograms: 0.04281kg
sacrose mass: 5.00g
Kf water: 1.86C/m

B. Graph data A: pure water cooling curve
minutes with temperature
0minutes: 20.0C
1 minutes: 3.0C
2 minutes: 3.0C
3minutes: 1.0C
4minutes:1.0C
7 minutes:1.0C
8 minutes: 0C
11 minutes:0C
12 minutes:0C
13 minutes:-1C
14 minutes:-1C
15 minutes: -1C

C. Graphic data B: solution cooling curve (sucrose and water)
minutes with temperature
0minutes: 2.0C
1 minutes:-2C
2 minutes:-2C
3 minutes:-2C
4 minutes:-3C
6 minutes: -4C
9 minutes:0C
10 minutes:0C
11 minutes:0C
12 minutes:-1C
13 minutes:-1C
14 minutes:-1C


1)show work:

Tf pure solvent (graph A):
Tf of the solution (graph B):
Decrease in freezing point:
molar mass of the soluto:

2) to determine the molar mass of an unknown solid, 0.500g of the compound was weighed and dissolved in 200mL of cyclohexane. Then, the freezing point of the solution was measured and a value of 3.64C was obtained. If for cyclohexane Tf=6.47C and kf= 20.2C/m, determine the molar mass of the unknown solid.

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