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A) If you started with 0.45g of Magnesium and ended with 1.07g of MgO. what would be the empirical formula of the compound?

B) Salicylic Acid is used to make asprin. Salicylic acid contains 60.8 mass % Carbon, 4.4 mass % Hydrogen and 34.8 madd % of Oxygen. What is the empirical formula for Salicylic acid?

C) On an average American adults consume about 219 g of caffeine, C8H10N4O2, per year. How many molecules of caffeine do Americans consume per year? And how many grams of Carbon do American consume in the caffine they drink?

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