posted by Amy .
A large cylinder of helium had a small hole through which the helium escaped ata rate of 0.0064 mol/hr. How long would it take for 0.010 mol of CO to leak through a similar hole if it were at the same pressure?
The effusion rate will be inversely proportional to the square root of molecular mass
rate= .0064mol/hr( sqrt MolemassHe/molmassCO)
after you compute that, then time=.010/rate