calculate the percentage by weight of potassium in potassium dicromate
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Percentage composition of an element in a compound is given by
% composition of element
= Mass of element in compound ÷ Mass of compound × 100
we have 1 mole of K2Cr2O7
Mass of 1 mole of compound = 294.185 g
Mass of Cr in 1 mole of compound = 2 × 52 g = 104 g
% composition of Cr = 104 g ÷(294.185 g × 100) = 35.35 %
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