Question

How many moles of oxygen, O2, are in a sample containing 1.43 x 10^24 molecules of O2?
A) 0.421 mol
B) 2.37mol
C) 4.74mol
D) 8.61 x 10^47mol
E) 1.16 x 10^-48mol

So I did the number divided the number of molecules of O2(1.43 x 10^24) by Avogadro's number(6.022 x 10^23).

I get B) 2.37mol. However, should I multiply this answer by 2 which will give me C) 4.74mol.

Answer 1

No. There are 6.022E23 MOLECULES of O2 in 1 mole of O2 so the answer is in MOLES of O2. Multiplying by 2 gives you the MOLES of O ATOMS.

Answer 2

So B) 2.37 is the correct answer?

Answer 3

I didn't do the math but 1.43E24/6.022E23 = ?

Answer 4

Yes

Answer 5

0.0166 mol