posted by s .
are these right?
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