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Unformatted text preview: Practice Problems for 1 st Semester Chemistry Exam, December 19-20, 2001 NOTE: Problems 1-3 below serve as a good review of basic reaction stoichiometry. Although they are short-answer problems, remember that the entire semester final will consist of multiple-choice problems. 1. Suppose ten hydrogen molecules and ten oxygen molecules are mixed. How many molecules of water could be formed? What would be left over? 2. How many moles of oxygen, O 2 , are required to produce 242 grams of magnesium oxide by the reaction 2 Mg + O 2 2 MgO 3. Iron burns in oxygen gas to form a black oxide, Fe 3 O 4 . Write a balanced equation for the reaction. If 0.558 gram of Fe is burned, how many moles of oxygen gas are required and how many grams of Fe 3 O 4 would be formed? Questions 4-6 are based on the combustion of cyclohexanol as shown in the following statement: C 6 H 12 O + ? O 2 ? CO 2 + ? H 2 O + energy 4. On scratch paper use one mole of cyclohexanol and write a balanced chemical equation for this...
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