Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively.

Determine the molecular formula of an oxide of iron in which the mass

1.	Determine the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively.
Answer» Solution : Empirical formula `=Fe_(2)O_(3)` `=2xx56+3xx16` `=160` `n=("MOLECULAR mass")/("Empirical formula mass")` `=(160)/(160)=1` Molecular formula `=n xx ` emplirical formula Molecular formula `= n xx` emplirical formula `=1xx(Fe_(2)O_(3))` `=Fe_(2)O_(3)`