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Chapter 5 Gases

1. Which of the following is/are characteristic(s) of gases?

A. High compressibility
B. Relatively large distances between molecules
C. Formation of homogeneous mixtures regardless of the nature of gases
D. High compressibility AND relatively large distances between molecules
E. High compressibility, relatively large distances between molecules AND formation of homogeneous mixtures regardless of the nature of gases

2. A small bubble rises from the bottom of a lake, where the temperature and pressure are 4C and 3.0 atm, to the water's surface, where the temperature is 25C and the pressure is 0.95 atm. Calculate the final volume of the bubble if its initial volume was 2.1 mL.
A. 0.72 mL
B. 6.2 mL
C. 41.4 mL
D. 22.4 mL
E. 7.1 mL

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3. Calculate the mass, in grams, of 2.74 L of CO gas measured at 33C and 945 mmHg.
A. 0.263 g
B. 2.46 g
C. 3.80 g
D. 35.2 g
E. 206 g


4. Which of the following gases will have the greatest density at the same specified temperature and pressure?
A. H2
B. CClF3
C. CO2
D. C2H6
E. CF4

5. Determine the molar mass of chloroform gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm3 at 97C. The pressure of the chloroform is 728 mmHg.
A. 187 g/mol
B. 121 g/mol
C. 112 g/mol
D. 31.6 g/mol
E. 8.28 10-3 g/mol

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