Question

If you have 2.2x10^24 molecules of O2 at STP, how many liters of O2 do you have?

Can someone show me how to solve this

Answer 1

1 mol O2 occupies 22.4 L at STP.
How many mols O2 do you have? You know 1 mol O2 at STP contains 6.02E23 molecules so you have
2.2E24/6.02E23 = ?mols.

Answer 2

3.65 moles?

Answer 3

Yes, 3.65 mols O2. You're half way there. The problem asks for the volume. So 1 mol will occupy 22.4 L at STP. How many L will 3.65 mols occupy?

Answer 4

Can you give me a better way to solve it please because I’m a tad bit confused on how to solve for it

Answer 5

If 1 mol O2 occupies 22.4 L at STP then 2 mol O2 will occupy 22.4 x 2 = ? and 3 mols will occupy 22.4 x 3 mol = ? etc.You have 3.45 mol O2. What volume will that occupy.

Look at the dimensional work.
At STP O2 occupies 22.4L so we know that is 22.4 L/mol. So 22.4 L/mol x # mol = ?L
You seem to be letting the "language of chemistry" confuse you. If I told you that 1 apple, cut up into small pieces, had a volume of 1 cup and I wanted to know how many cups 3.45 cut up apples would occupy, you would tell me immediately that it would be 1 cup/apple x 3.45 apples = ? cups. But when we change the units to Liters and mols and use oxygen instead of apples you get confused and don't know what to do. Do you see what I mean? You are letting the words confuse you when common sense tells you what to do. Don't get discouraged. Many students do this at the beginning.