Answered: If equal masses of C2H2, C2H4, and C3H6…

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter9: Liquids And Solids

Section: Chapter Questions

Problem 41E: In each of the following groups of substances, pick the one that has the given property. Justify...

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Question

1. If equal masses of C2H2, C2H4, and C3H6 are placed in a flask, which of the following is true?

a) Partial pressure of C3H6 is greater than that of C2H4, which is greater than that of C2H2.

b) Partial pressure of C2H4 is greater than that of C2H2, which is greater than that of C3H6.

c) They each have the same partial pressure.

d) Partial pressure of C2H2 is greater than that of C2H4, which is greater than that of C3H6.

2. You have a sample of hydrogen gas containing H2 and D2 (Deuterium) that you want to separate into pure components. What is the relative rate of diffusion of H2 to D2 (ratio between rate of H2 to rate of D2)? (H = 1.008 g/mol; D = 2.016 g/mol)

3. A 4.500-g sample containing sodium carbonate (105.99 g/mol) and other impurities is titrated with 0.15 M HCl solution. The initial buret reading is 2.34 mL. The final buret reading is 37.85 mL when the titration reaches the end point. Assuming sodium carbonate is the only component in the sample that reacts with HCl, what is the percent by mass of sodium carbonate in the sample? Na2CO3 + 2HCl --> 2NaCl + H2O + CO2

Expert Solution

Step 1

In same amounts of gaseous mixtures with increasing of molecular mass of a gas decreases it's parial pressure.

Molar mass order C₃H₆ > C₂H₄ > C₂H₂

Therefore partial pressure decreases in reverse order of molar masses.

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