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Calculate the number of moles in each substance

a. 1.68 g of magnesium ions
b. 69.6 g of sodium hypochlorite
c. 4.27 * 10^24 molecules of carbon monoxide

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a and b. mols = grams/molar mass = ?
c. There are 6.02 x 10^23 molecules in a mole of molecules.
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