The sample contains both Fe and oxygen
The mass of the sample is 36 g
28 g are Fe and 8 g are O
So to find the percent composition we can calculate using the following formula
Percent composition of the element = mass of the element / mass of the sample x 100%
Percent composition of Fe = 28 g / 36 g x 100 % = 77.8%
Percent composition of O = 8 g / 36 g x 100 % = 22.2%
The percentage composition for each of the elements is
Fe =77.8 % oxygen= 22.2%
calculation
% composition = mass of the element/total mass x100
total mass = 36g
The % composition of Fe = 28/36 x100 = 77.8%
The % composition of oxygen = 8/36 x100 = 22.2%
