A large cylinder of helium filled at 2000 mm of Hg had a small orifice through which helium escaped into evacuated space at the rate of 6.4 moles/hour. How long would it take for 10 moles of CO to leak through a similar orifice if the CO was confined at the same pressure ?

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2.1 hour

4.2 hour

5.6 hour

11.2 hour.

answer is B.

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Detailed Solution

rHerCO=MCOMHe=284=2.65 rCO =rHe2.65 = 6.42.65=2.4 mol/hr time taken for the effusion of 10moles of CO , tCO=102.4≈4.2 h

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