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[Tutorial: Mole conversions - mass to molecules] This question guides you through calculating the number of molecules present in a sample of a compound with a given mass and chemical formula. The following sequence of conversions will be used: mass moles molecules A dose of Pepto Bismol contains 525mg of bismuth subsalicylate (C7H5BiO4). Step 3: Calculate the number of molecules. The molar mass of C7H5BiO4 is 362.1g/mol, and multiplying moles by Avogadro's number gives molecules. A dose of Pepto Bismol