The fourth (last) one in 2-8-8-2.
Explanation:
finally I have given you answer hope it will help you successfully
B) 6
one above one below and 2 on the left and right sides
<span>NO2 weighs 46.005 grams per mol. There are 6.02x10^23 molecules in a mol. In the given sample of 189.5 grams, there are 4.12 mols. This means that there are 2.48x10^24 molecules of NO2 in the given sample.</span>