Question

What is the molar mass of oxygen, O2? (Round to four significant figures only.)

Answer 1

The molar mass of oxygen would be calculated as follow:
\[M(O _{2})/g/mol=2*m(O)\]
Try doing that.

Answer 2

You know the atomic mass of oxygen?

Answer 3

wld it be 8?

Answer 4

Not quite, do you have a periodic table in front of you?

Answer 5

yeah.. oh 16? haha

Answer 6

Exactly. now that is for 1 oxygen atom. So we need to multiply It with 2 to get it for a oxygen molecule :)

Answer 7

ohk :) so it wld be 32??

Answer 8

Exactly, except you don't have 4 significant figures :)

Answer 9

32.00? haha

Answer 10

Yes :) now we need a unit :)

Answer 11

Well I can say that when you does it this way it become gram/mol. :)

Answer 12

ohh haha.. im not great at chemistry :p

Answer 13

Doing fine. So the answer would be? ;)

Answer 14

32.00 grams? haha

Answer 15

/mol remember that, it is quite important :)

Answer 16

alright then :) thanks

Answer 17

Because when you say that you indicate that O2 weights 32 gram if you have about 602 trillion O2 molecules :)
No problem at all.

Answer 18

okay then :)thanks once again