Calculating the Molar Mass of an Unknown Gas

[irNewton]

Homework Statement

It takes 16.6 min for a 10.0 mL sample of an unknown gas to effuse through a pinhole. A 10.0 -mL sample of
helium, He, required 5.00 min. What is the molar mass of the unknown gas?

Homework Equations

No idea =/

The Attempt at a Solution

No idea =/
Don't know the relationship between time and volume and moles @__@

 

[Borek]

Check Graham's law.

--
methods