Question

What is the percent by mass of oxygen in fe2o3

Answer 1

To get the formula mass we have to add the atomic mass of each atom
(55.847 x 2) + ( 16 x 3) = 160
this means that 16 x 3 = 48 are the grams of O
% = 48 x 100 / 160 =30 %

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Answer 2

30% is the answer. Good luck