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Question

A flask containing 10g of a Gas relative molecular mass 100 at a pressure of 100kPa  was evacuated to a pressure of 0.01 kPa at constant temperature. Which one of the following is the best estimate of the number of molecules left in the flask?



Your Answer
A

6.02X1016

Your Answer
B

6.02X1017

Correct Answer
C

6.02X1018

Your Answer
D

6.02X1019


Solution

The correct option is C

6.02X1018


PVnT=R(constant)

P1V1n1T1=P2V2n2T2

When, V1=V2 and T1=T2
P1n1=P2n2n2=0.1×0.01100
n2=1×105
Number of molecules left = n2N
=1×105×6.02×1023=6.02×1018

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