= 5 X 10 X 3 m ^3

= 150 m^3

One cubic meter contains 1000L

so 150 cubic meters will contain

= 50 X 1000L

= 50000 L

22.4L of any gas contains 6.02 x 10^23 molecules

1 L of any gas will contain

= 6.02 x 10^23 molecules/22.4

= 0.26875 x 10^23 molecules

& 50000 L of any gas will contain

= 50000 x 0.26875 x 10^23 molecules

= 13437.5 x x 10^23 molecules

28 mi/h = miles /hour????

How did you come up with that?

Maybe you looked up the wrong answer

V = l * w * h = (10m)(5m)(3m) = 150m^3

Next, multiply that by 1000L/m^3. This will let you know how many liters of oxygen are in the room. So there are 150000L in the room. Now, they tell you that for every 22.4L there are 6.02 x 10^23 molecules. So you have to multiply150000L by (6.02 x 10^23)/(22.4L) and that will tell you how many molecules: 150000L(6.02×10^23)/22.4L = 40312.5 x 10^23 molecules.

The person above me is wrong because they found the volume to be 150 but a few lines latter plugged in 50 instead

____________________ x 6.02 x 10^23 = 4.031 x 10^27

22.4 L

28 miles per hour is a value of speed, this can’t be the answer to THIS problem