Can you help me with this rate of effusion problem?

Question

How do I calculate which of these pairs of gases have the most nearly identical rates of effusion?

 

A. CO and CO2

 

B. CO and N2

 

C. NO2 and N2O4

 

D. N2O and NO2

 

E. N2 and O2

 

Answer 1

Rates of Effusion, according to Graham's Law are inversely proportional to the square root of the molar mass of the gas.

Find the two gases that have the most similar molar masses, and they will have similar rates of effusion.