Question

0.25 mole of o2 men's how many molecules

Answer 1

firstly its "means" not men's
and 1mole has 6.02 x 10 power 23 molecules
so 0.25 means 1.505 x 10 power 23 molecules

Answer 2

Mole = no. Of molecules / 6.022 × 10^23

0.25 = no. of molecules / 6.022 ×10^23

No. of molecules = 0.25 × 6.022 × 10^23

= 1.50550 × 10^23

Hope this will help u ....