Question

A flask A contains 0.5 mole of oxygen gas. Another flask B contains 0.4 mole of ozone gas. Which of the two flasks contains greater number of oxygen atoms.

Answer 1

Flask A: 

1 mole of oxygen gas = 6.023 x 10²³ molecules 

∴ 0.5 mole of oxygen gas = 6.023 x 10²³ x 0.5 molecules 

The number of atoms in flask A = 6.023 x 10²³ x 0.5 x 2 = 6.023 x 10²³ atoms. 

Flask B: 

1 mole of ozone gas = 6.023 x 10²³ molecules

0. 4 mole of ozone gas = 6.023 x 10²³ x 0.4 molecules 

The number of atoms in flask B = 6.023 x 10²³ x 0.4 x 3 = 7.227 x 10²³ atoms. 

∴ Flask B contains a great number of oxygen atoms as compared to flask A.