are these right?

Question

How many atoms are there in 1.3x10^22 molecules NO2?

atoms=(1.3x10^22 molecules NO2) x (2atoms/1molecule) = 2.6x10^22 atoms NO2

A 5.0g sample of O2 is in a container at STP. How many atoms of oxygen are in the container?

atoms = (5.0g O2) x (1mol/32g)x (6.02x10^23 molecules/1mol) x (2atoms/1mol) = 1.9x10^23 atoms O2

thanks

Answer 1

I didn't check the math but #2 is worked correctly. #1 is not correct. The question asks for the number of atoms and there are three atoms per molecule of NO2; i.e., 1 N atom and 2 O atoms = 3 atoms total.

Answer 2

thank you!

Answer 3

gergargfvfd

Answer 4

the first is 3.9x10^22

Answer 5

Wouldn't you have to multiply the number of molecules (1.3 x 10^23) by the molecular mass of NO2 (46.01). Therefore, it would equal 6.0 x 10^23.