What is the molecular formula of a material with percentage composition #C:40.5%#, #H:6.67%#, #O:53.33%#, and molecular mass of #180.0*g*mol^-1#?
This is a standard question, and as a routine we ASSUME a mass of
So if there are
We divide thru by the LOWEST molar quantity, that of oxygen/carbon to give an empirical formula of:
But we also have the molecular mass,
Now it is a fact that the molecular formula is always a whole number multiple of the empirical formula, and thus..............
Just on a practical issue, an analyst would normally NEVER give you the percentage oxygen by mass. Most of the time you get