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​Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0×10–15 atm. at room temperature (300 K). Taking R = 8.3 JK-1mol-1, 1 atm = 105 Pa and NAvogadro = 6 ×1023 mol−1 , the mean distance between molecules of gas in an evacuated vessel will be of the order of :
  • a)
    0.2 μm
  • b)
    0.2 mm
  • c)
    0.2 cm
  • d)
    0.2 nm
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0&ti...
Assume the average distance between the gas molecules is r. Then by ideal gas equation.


Substitute the values in the above expression,

r = 0.2 mm
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Most Upvoted Answer
Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0&ti...
× 10^-9 torr.
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Modern vacuum pumps can evacuate a vessel down to a pressure of 4.0×10–15 atm. at room temperature (300 K). Taking R = 8.3 JK-1mol-1, 1 atm = 105 Pa and NAvogadro = 6 ×1023 mol−1 , the mean distance between molecules of gas in an evacuated vessel will be of the order of :a)0.2 μmb)0.2 mmc)0.2 cmd)0.2 nmCorrect answer is option 'B'. Can you explain this answer?
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