wt. of empty flask with foil and wire, (g) Weight of empty flask (g) Weight of water (g) Density of water (g/mL) Temperature of boiling water (K) Volume of Erlenmeyer flask (mL) 123.98 123.67 (1) 0.99777 371.15 (2) Atmospheric pressure, (mm Hg) 758.35 Benzene TRIALS 1 3 Weight of flask with condensed vapor with foil and wire (g) Weight of condensed vapor (g) Molecular weight of benzene (g/mol) Mean Molecular Weight (g/mol) True Value (g/mol) % error 124.65 124.62 124.567 0.67 0.64 0.587 (3) (4) (5) (6) 78 (7) Chloroform TRIALS 1 2 3 Weight of flask with condensed vapor with foil and wire (g) Weight of condensed vapor (g) Molecular weight of chloroform (g/mol) Mean Molecular Weight (g/mol) True Value (g/mol) 125.0032 124.9954 125.0121 1.0232 1.0154 1.0321 (8) (9) (10) (11) 119.35 % error (12) Unknown Liquid TRIALS 1 2 3 Weight of flask with condensed vapor with foil and wire (g) Weight of condensed vapor (g) Molecular weight of unknown liquid (g/mol) 124.4865 124.4789 124.49 0.507 0.4989 0.51 (14) (16) 58 (17) (18-20) (13) (15) Mean Molecular Weight (g/mol) True Value (g/mol) % error What may this liquid be? (Clue: ketone)

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...
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Calculation of Molar Mass of Unknown Liquid
Using the Density Determined via Dumas
Method
Weight of flask filled with water (g)
385.76
Transcribed Image Text:Calculation of Molar Mass of Unknown Liquid Using the Density Determined via Dumas Method Weight of flask filled with water (g) 385.76
wt. of empty flask with foil and wire, (g)
Weight of empty flask (g)
Weight of water (g)
Density of water (g/mL)
Temperature of boiling water (K)
Volume of Erlenmeyer flask (ml)
123.98
123.67
(1)
ר0.9977
371.15
(2)
Atmospheric pressure, (mm Hg)
758.35
Benzene
TRIALS
1
3
Weight of flask with condensed vapor with foil
and wire (g)
Weight of condensed vapor (g)
Molecular weight of benzene (g/mol)
Mean Molecular Weight (g/mol)
True Value (g/mol)
124.65
124.62
124.567
0.67
0.64
0.587
(3)
(4)
(5)
(6)
78
% error
(7)
Chloroform
TRIALS
1
2
3
Weight of flask with condensed vapor with foil
and wire (8)
Weight of condensed vapor (g)
Molecular weight of chloroform (g/mol)
125.0032
124.9954
125.0121
1.0232
1.0154
1.0321
(8)
(9)
(10)
Mean Molecular Weight (g/mol)
True Value (g/mol)
(11)
119.35
% error
(12)
Unknown Liquid
TRIALS
1
2
Weight of flask with condensed vapor with foil
and wire (g)
Weight of condensed vapor (g)
Molecular weight of unknown liquid (g/mol)
124.4865
124.4789
124.49
0.507
0.4989
0.51
(13)
(14)
(16)
58
(15)
Mean Molecular Weight (g/mol)
True Value (g/mol)
% error
(17)
(18-20)
What may this liquid be? (Clue: ketone)
Transcribed Image Text:wt. of empty flask with foil and wire, (g) Weight of empty flask (g) Weight of water (g) Density of water (g/mL) Temperature of boiling water (K) Volume of Erlenmeyer flask (ml) 123.98 123.67 (1) ר0.9977 371.15 (2) Atmospheric pressure, (mm Hg) 758.35 Benzene TRIALS 1 3 Weight of flask with condensed vapor with foil and wire (g) Weight of condensed vapor (g) Molecular weight of benzene (g/mol) Mean Molecular Weight (g/mol) True Value (g/mol) 124.65 124.62 124.567 0.67 0.64 0.587 (3) (4) (5) (6) 78 % error (7) Chloroform TRIALS 1 2 3 Weight of flask with condensed vapor with foil and wire (8) Weight of condensed vapor (g) Molecular weight of chloroform (g/mol) 125.0032 124.9954 125.0121 1.0232 1.0154 1.0321 (8) (9) (10) Mean Molecular Weight (g/mol) True Value (g/mol) (11) 119.35 % error (12) Unknown Liquid TRIALS 1 2 Weight of flask with condensed vapor with foil and wire (g) Weight of condensed vapor (g) Molecular weight of unknown liquid (g/mol) 124.4865 124.4789 124.49 0.507 0.4989 0.51 (13) (14) (16) 58 (15) Mean Molecular Weight (g/mol) True Value (g/mol) % error (17) (18-20) What may this liquid be? (Clue: ketone)
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