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Grade 12Physical Chemistry

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.

sudhanshu

12 Years agoGrade 12

1 Answer

Gaurav

11 Years ago

Elements	Symbol	% by mass	Atomic Mass	% by mass/atomic mass	simple ratio	simple whole number ratio
Iron	Fe	69.9	55.85	69.9/55.85 = 1.25	1.25/1.25=1(divide by smaller number of privious coloumn)	2(multiply by 2 to change in whole number )
Oxygen	O	30.1	16.00	30.1/16.00 =1.88	1.88/1.25=1.5	3

Empirical formula mass of Fe2O3 = 159.7
Molar mass of Fe2O3 = 159.69
So n = 1
Or empirical formula is same as molecular formula

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