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.

Explanation

Flask A : 1 mole of oxygen gas = `6.023xx10^(23)` molecules
`:.` 0.5 mole of oxygen gas = `6.023xx1O^(23)xx0.5` molecules
The number of atoms in flask A = `6.023xx10^(23)xx0.5xx2`
= `6.023xx10^(23)` atoms.
Flask B: 1 mole of ozone gas = `6.023xx10^(23)` molecules
`:.` 0.4 mole of ozone gas = `6.023 xx 10^(23)xx0.4` molecules
The number of atoms in flask B = `6.023xx10^(23)xx0.4xx3`
= `7.227xx10^(23)` atoms.
`:.` Flask B contains a great number of oxygen atoms as compared to flask A.