A compound contains 69.94 percent iron and 30.06 percent oxygen. What is its molecular formula if the molar mass of the compound is 199.55 per mole?
As with all these problems, we ASSUME, that there is a
We break this quantity down into atoms.
And, there is
If we divide thru by the lowest molar amount, we get an empirical formula of
Note that an examiner would be quite justified at A level to say that