Question

4.72 moles of sulfur trioxide molecules contain how many oxygen atoms?


i know the answer is 8.53 x 10^24
but i do know how my professor got it


**this is one of my practice exam question!

Answer 1

1 mol of a molecule contains 6.022E23 molecules. You have 4.72 moles; therefore,
4.62 x 6.022E23 = 2.842E24 molecules of SO3. There are 3 atoms of oxygen per 1 molecule of SO3; therefore, the number of oxygen atoms must be 3 times that or
2.842E24 x 3 = 8.527E24 which rounds to 8.53E24 to 3 significant figures.

Answer 2

Uh... 4.62 x 6.022 is 27.82164 how did you get 2.842?

Answer 3

Marcus his is 4.62x6.02x10^23=2.842x10^24 it’s scientific notation.