Question

The number of molecules in 22.4dm3 of nitrogen gas at STP is

Answer 1

The molar gas volume at stp is :

22.4litres = 1 mole

1dm³ = 1litre

According to Avogadros constant :

At stp the molecules of a gas per mole is :

1 mole = 6.022 × 10²³ molecules

Given that the volume given is of one mole at stp, the number of molecules will be :

6.022 × 10²³ molecules