Chemistry Practice Problems Effusion Practice Problems Solution: It takes 125 minutes for 10 mL of Ar gas to effuse...

Solution: It takes 125 minutes for 10 mL of Ar gas to effuse through a porous barrier. How many minutes would it take the same amount of Ne gas to effuse through the same barrier?A. 108.4 min B. 70 min C. 72.5 min D. 85.3 min E. 88.8 min

Problem

It takes 125 minutes for 10 mL of Ar gas to effuse through a porous barrier. How many minutes would it take the same amount of Ne gas to effuse through the same barrier?

A. 108.4 min 

B. 70 min 

C. 72.5 min 

D. 85.3 min 

E. 88.8 min

Solution

We’re being asked to identify the unknown gas given the rate of effusion of O2.


Recall that Graham's Law of Effusion allows us to compare the rate of effusion of two gases. Graham's Law states that the rate of effusion of a gas is inversely proportional to its molar mass.


rate=1MMgas


This means that when comparing two gases:


rategas 1rategas 2=MMgas 2MMgas 1


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