Which of the following gases will effuse out of football bladder most quickly ? A. He B. H2 C. N2 D. O2

The correct answer is Helium (He).

The rate of effusion of a gas is inversely proportional to the square root of its molar mass. This means that the gas with the lowest molar mass will effuse the fastest. Helium has the lowest molar mass of any

gas, followed by hydrogen (H2), nitrogen (N2), and oxygen (O2). Therefore, helium will effuse out of a football bladder most quickly.

Here is a table of the molar masses of the four gases:

Gas | Molar Mass
——- | ——–
Helium (He)

| 4.002602 g/mol
Hydrogen (H2) | 2.016000 g/mol
Nitrogen (N2) | 28.0134 g/mol
Oxygen (O2) | 32.0000 g/mol

As you can see, helium has the lowest molar mass, followed by hydrogen, nitrogen, and oxygen. Therefore, helium will effuse out of a football bladder most quickly.