1) Determine the mass of the condensed portion of the unknown that you placed in the test tube. 2) Use the mass of the water in the test tube and it’s density to calculate the volume of the test tube. 3) Use the calculations from Questions 1 & 2, along with the temperature of the boiling water bath and the barometric pressure of the room, to calculate the molar mass of the unknown compound. 4) identify the unknown liquid substance that you tested. 5) Using the SAMPLE data, calculate the molecular weight of the unknown and determine the identity from the chart.
1) Determine the mass of the condensed portion of the unknown that you placed in the test tube. 2) Use the mass of the water in the test tube and it’s density to calculate the volume of the test tube. 3) Use the calculations from Questions 1 & 2, along with the temperature of the boiling water bath and the barometric pressure of the room, to calculate the molar mass of the unknown compound. 4) identify the unknown liquid substance that you tested. 5) Using the SAMPLE data, calculate the molecular weight of the unknown and determine the identity from the chart.
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
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
1) Determine the mass of the condensed portion of the unknown that you placed in the test tube.
2) Use the mass of the water in the test tube and it’s density to calculate the volume of the test tube.
3) Use the calculations from Questions 1 & 2, along with the temperature of the boiling water bath and the barometric pressure of the room, to calculate the molar mass of the unknown compound.
4) identify the unknown liquid substance that you tested.
5) Using the SAMPLE data, calculate the molecular weight of the unknown and determine the identity from the chart.
Transcribed Image Text:11. Record the barometric pressure in the room.
12
Rinse out the test tube and fill it to the top with tap water. Cover the test tube with aluminum
foil. Measure and record the mass of the test tube, water, and foil.
13. Repeat this procedure for a second trial.
DATA TABLE
Trial 1
Trial 2
Mass of test tube and foil cover (g)
31.810g
NA
Temperature of water bath (°C)
Mass of test tube and foil and gas sample (g) 31.920g
99.6 °C
NA
NA
Barometric pressure
29.52 Hg
NA
Mass of test tube and foil and water (g)
88.907g
NA
Molar Mass's for various compounds:
Acetone
58.08 g/mol
Acetonitrile
41.05 g/mol
Diethyl ether
74.12 g/mol
Ethyl Acetate
88.11 g/mol
Toluene
92.14 g/mol
Advanced Chemistry with Vernier
3
POST-LAB QUESTIONS
1. Determine the mass of the condensed portion of the unknown that you placed in the test
tube.
2. Use the mass of the water in the test tube from Step 12 of the procedure and its density to
calculate the volume of the test tube.
3. Use the calculations from Questions 1 and 2, along with the temperature of the boiling
water bath and the barometric pressure of the room, to calculate the molar mass of your
unknown compound.
4. Identify the unknown liquid substance that you tested.
5. Using this sample data, calculate the molecular weight of the unknown and determine the
identity from the chart.
SAMPLE DATA
Temperature of water bath (°C)
99°C
Mass of test tube and foil cover (g)
7.5228 g
Mass of test tube and foil and gas sample (g)
7.5387 g
Barometric pressure (kPa)
100.0 kPa
Mass of test tube and foil and water (g)
16.1228 g
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