A flask contains 12 g of a gas of relative molecular mass 120 at a pressure of 100 atm was evacuated by means of a pump until the pressure was 0.01 atm. Which of the following is the best estimate of the number of molecules Ieft in the flask? ( No = 6 x 1023 mol-1)

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6×1019

6×1018

6×1017

6×1013

answer is B.

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Detailed Solution

pV=nRT⇒p∝n n2=n1p2p1=0.1×0.01100mol=10−5 ∴ molecules =N0×10−5=6.02×1018

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