How many moles of KI are in 4.04 x 1024 formula units?

Multiply the molecular weight by the number of moles for the substance. The molecular weight is the number of grams per mole for the substance and gives the conversion factor for moles to grams for that particular substance. So, one mole of water has a mass of 18.02 grams (1 mol H2O x 18.02 g/mol = 18.02 g).

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it's c. elements are placed in rows based on how may valencies electrons have.