Question

100 grams of oxygen (O₂) gas and 100 grams of helium (He) gas are taken in separate containers of equal volume at 100°C. Which one of the following statement is correct?

1. Both gases would have the same pressure.

2. The average kinetic energy of O₂ molecules is greater than that of He moleules.

3. The pressure of He gas would be greater than that of the O₂ gas.

4. The average kinetic energy of He and O₂ molecules is same.

Answer 1

Correct option: 3. The pressure of He gas would be greater than that of the O₂ gas.

Explanation: 

Since mass of Oxygen and Helium is same which is = 100 g,

So helium contains more number of molecule than oxygen therefore helium exerts more pressure than oxygen.