Calculate the percentage by weight of potassium in potassium dicromate

1.	Calculate the percentage by weight of potassium in potassium dicromate
Answer» 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 %

Answer»

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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