chemistry help on ideal gas law.?

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LYYY

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1) What is the molar mass of a gas if it diffuses 0.907 times the speed of argon gas?

2) Uranium isotopes are separated by effusion. What is the relative rate of effusion for 235 UF6 ( M= 349.03 g/mol) and 238 UF6 ()
M= 352.04 g/mol


Please explain and thank you =)
 
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