Question

calculate number of molecules in 1 ml of o2 at NTP

Answer 1

22400ml O2 = Na molecules
1ml= 1ml×Na/22400
= 2.6 x 10^19

Answer 2

1 mol of gas = 22414 mL = avogadro's number (6.02* 10^23) of molecules

1 mL = 6.02* 10^23 / 22414 =2.68 * 10^19 molecules