21.  A container has two gases at 27°C, one with molar volume 6 L/mole, another with molar volume 3 L/mole, what is the total pressure of the container? 
a.  6.9 atm 
b.  8.5 atm 
c.  12.3 atm 
d.  15.8 atm 
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Answer: (c).12.3 atm

22.  The fraction of gas in a container is 0.1, if the total pressure of the container is 10 atm, what is the partial pressure of the gas? 
a.  1 atm 
b.  5 atm 
c.  10 atm 
d.  20 atm 
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Answer: (a).1 atm

23.  The fraction of gas in a container is 0.5, if the total volume of the container is 6 liter, what is the volume of the gas? 
a.  2 liter 
b.  3 liter 
c.  5 liter 
d.  6 liter 
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Answer: (d).6 liter

24.  A gas mixture contains 30% CO₂, 40% O₂, 30% N₂, if the partial pressure of CO₂ is 6 Pa, what is the total pressure of gas mixture? 
a.  6 Pa 
b.  10 Pa 
c.  20 Pa 
d.  60 Pa 
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Answer: (c).20 Pa

25.  The highest pressure gas of a mixture has partial pressure p, the partial pressure of other gases decreases by factor of 2^(n1), the partial pressure of second gases decreases by a factor of 2, partial pressure of third gas increases by 4, and so on, if the total pressure of gas mixture is 31p/16, how many gases are present in the mixture? 
a.  3 
b.  5 
c.  10 
d.  15 
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Answer: (b).5
