# Question #6cee9

##### 2 Answers

The ratio of rates

Graham's Law states that:

Rate of effusion

Where

For two gases:

So

Use **Grahams's law**, which states that the rate of effusion of a gas is *inversely proportional* to the square root of *molar mass*.

This means that the rate of effusion of chlorine gas will be

Likewise, the rate of effusion of nitrogen gas will be

If you divide these two expressions, you'll get the ratio of effusion rates of chlorine and nitrogen

The numerical value of this ratio will be

Here is a video which shows how to solve a different problem using Graham's law.

Video from: Noel Pauller

Hope this helps!