# Question #8e8f6

##### 1 Answer

Feb 8, 2017

The volume of hydrogen is 200 mL.

#### Explanation:

**Graham's law of effusion states** that the rate of effusion of a gas is inversely proportional to the square root of the mass of its molecules.

We can write the formula as

#color(blue)(bar(ul(|color(white)(a/a) r_2/r_1 = sqrt(M_1/M_2)color(white)(a/a)|)))" "#

where

If gas 2 is hydrogen and gas 1 is oxygen, then

Hydrogen diffuses 3.984 times as fast as oxygen, so the original volume of oxygen must be