Calculate the percentage composition of chromium in potassium dichromate?

The Percentage composition of an element in a compound is given by

% composition of element = Mass of element in compound / Mass of compound x 100

we have 1 mol of potassium dichromate (K2Cr2O7)

Mass of 1 mol of compound = 294.185 g

Mass of Cr in 1 mol of compound = 2 × 52 g = 104 g

% composition of Cr=104 g/294.185 g × 100

35.35%

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