Determine the empirical formula of an oxide ...

NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

Question : 3 of 36

Marks: +1, -0

Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% oxygen by mass.

Solution:

Element	Atomic mass	%	Mole of atom	Mole ratio	Simplest whole no. ratio
Fe	56	69.9	$\frac{69.9}{56}$ = 1.25	$\frac{1.25}{1.25}$ = 1	2
O	16	30.1	$\frac{30.1}{16}$ = 1.88	$\frac{1.88}{1.25}$ = 1.5	3

Hence, the empirical formula is

\mathrm{Fe}_2\mathrm{O}_3

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