How to solve these questions on Chemistry?

Question

Thew title of this topic in Chemistry is "Graham's Law of Diffusion." It's entirely okay if you'll provide your own datas/numbers, cuz' I'm only concerned with the solution on how to solve these. As long as I get to know how to solve these questions then it's okay for me. :)

Basically here's the questions:

 

1. Rate of Diffusion of HCL (Hydrochloric Acid)

2. Rate of Diffusion of NH₃ (Ammonia)

3. Observed ratio of diffusion rate pf HCL/NH₃

4. Calculated ratio of diffusion rate of HCL/HN₃

5. % Difference between calculated and observed

Answer 1

Graham's Law of Diffusion or Effusion basically says the the rate of diffusion of gas1/rate gas2 = sqrt MW2/sqrt MW1

Or, put another way, the rates of diffusion of two gases are inversely proportional to the square roots of their molar masses.  So, heavier gases diffuse slower than lighter gases.

 

If gas 1 is HCl and gas 2 is NH3, then rate HCl/rate NH3 = sqrt 17/sqrt 36.5

rate HCl/rate NH3 = 4.12/6.04

rate HCl/rate NH3 = 0.68 <---this is the calculated ratio of diffusion rate of HCl/NH3 or answer to (4) above.

 

Can't answer (3) and/or (5) as we don't know the observed ratio