How do you get the H2 ,O3 ,CO ,NH3 ,N2O4 ,C4H10 formula mass ? please insert an explanation and i'll give you the branliest

How do you get the H2 ,O3 ,CO ,NH3 ,N2O4 ,C4H10 formula mass ? pleas

1.	How do you get the H2 ,O3 ,CO ,NH3 ,N2O4 ,C4H10 formula mass ? please insert an explanation and i'll give you the branliest
Answer» hey MATE here is your ANSWER....please MARK as BRAILIEST if you like it....