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1. a) What is the mass of 2.401022 molecules of SO3 ? b) How many oxygen atoms are in 2.401022 molecules of SO3 ? c) What is the of in SO3 ? 2. Determine the empirical formula of a compound composed of 36.50%Na,38.10%O, and 25.40%S. 3. The empirical formula of a compound is CH2O. If the molar mass of the compound is 150.15g/mole, what is its molecular formula? 4. What mass of NH3 must react to produce 189g of H2O ? 4NH3+7O24NO2+6H2O 5. A reaction mixture contains 2.20g of Mg and 6.48g of O2. What mass of Mgo is produced