Question

You have collected

1. 2 litres of CO₂
2. 3 litres of chlorine
3. 5 litres of hydrogen
4. 4 litres of nitrogen and
5. 1 litre of SO₂

under similar conditions of temperature and pressure. Which gas sample will have the least number of molecules? Justify your answers.

Answer 1

According to Avogadro's law, equal volumes of gases contain equal no. of molecules under similar conditions of temperature and pressure. This means more volume will contain more molecules and least volume will contain least molecules.

So, 1 litre of SO₂ will contain the least number of molecules.