Question

A flask P contains $0.5$ mole of oxygen gas and another flask Q contains $0.4$ mole of ozone(${\mathrm{O}}_3$) gas. Which of the two contains larger number of oxygen atoms?

Answer 1

Flask P,

1 mole oxygen gas = $6.023\times {10}^{23}$molecules

$0.5mole$oxygen gas = $0.5\times 6.023\times {10}^{23}$molecules

No. of atoms in the flask P= $2\times 0.5\times 6.023\times {10}^{23}$atoms

=$6.023\times {10}^{23}$atoms

Flask Q,

1 mole ozone gas =$6.023\times {10}^{23}$molecules

$0.4mole$ozone gas = $0.4\times 6.023\times {10}^{23}$molecules

No. of atoms in flask Q = $3\times 0.4\times 6.023\times {10}^{23}$atoms

= $7.227\times {10}^{23}$atoms