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Question

It takes 26 s for 10 mL of H2 to effuse through a porous membrane. It takes 130 s for 10 mL of an unknown gas to effuse. Hence, molecular weight of the unknown gas is (in gmol1 )



A

100

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B

80

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C

50 

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D

40

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Solution

The correct option is B

50 


rH2=1026 mLs1

rx=10130 mLs1

rH2rx=102610130=mxmH2=mx2

5=mx2

mx=50 gmol1


Chemistry

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