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Question

# A flask containing 10g of a Gas of 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?

A

6.02X1016

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B

6.02X1017

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C

6.02X1018

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D

6.02X1019

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Solution

## The correct option is C 6.02X1018 PVnT=R(constant) P1V1n1T1=P2V2n2T2 When, V1=V2 and T1=T2 ∴P1n1=P2n2⇒n2=0.1×0.01100 n2=1×10−5 Number of molecules left = n2N =1×10−5×6.02×1023=6.02×1018

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