The ethyl mercaptan concentration in a mixture was determined by shaking a 2.0430-g sample with 50.00 mL of 0.01204 M I2 in a tightly stoppered flask: 2C2H5SH + I2 ---> C2H5SSC2H5 + 2I- + 2H+ The excess I2 was back-titrated with 18.23 mL of 0.01437 M Na2S2O3. Calculate the percentage of C2H5SH (MW = 62.13 g/mol).Millimoles of excess standard I2 solution is ___0.52390.34000.2620 0.1310 Millimoles of C2H5SH in the sample is ___ . 0.94200.68000.4710 0.2355 Percentage of C2H5SH in the sample is ___ .0.72 2.86 2.07 1.43

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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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The ethyl mercaptan concentration in a mixture was determined by shaking a 2.0430-g sample with 50.00 mL of 0.01204 M I₂ in a tightly stoppered flask:

2C₂H₅SH + I₂ ---> C₂H₅SSC₂H₅ + 2I^- + 2H⁺

The excess I₂ was back-titrated with 18.23 mL of 0.01437 M Na₂S₂O₃. Calculate the percentage of C₂H₅SH (MW = 62.13 g/mol).

Millimoles of excess standard I₂ solution is ___

0.5239
0.3400
0.2620
0.1310

Millimoles of C₂H₅SH in the sample is ___ .

0.9420
0.6800
0.4710
0.2355

Percentage of C₂H₅SH in the sample is ___ .

0.72
2.86
2.07
1.43

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