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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* SUMMARY: Stoichiometry PRACTICE: Hydrogen peroxide (H 2 O 2 ) decomposes into water and oxygen gas. How many moles of oxygen gas are formed from the decomposition of 3 moles of hydrogen peroxide? 1. 1 2. 1.5 3. 3 4. 6 5. 2 6. 0 * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 17
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Photosynthesis occurs by the following chemical reaction. If a plant consumes 28.9 g of CO 2 in one week, what mass of glucose (g) can the plant produce? Molar mass: CO 2 = 44.01 g/mol; C 6 H 12 O 6 = 180.2 g/mol 6CO 2 (g) + 6H 2 O 6O 2 (g) + C 6 H 12 O 6 (aq) A. 42.3 g B. 19.7 g C. 118 g D. 60.5 g PRACTICE: What mass of oxygen is needed for the complete combustion of 155 mL of C 6 H 6 (molar mass = 78.1 g/mol) to produce carbon dioxide and water? Density of C 6 H 6 = 0.88 g/mL. 2 C 6 H 6 (l) + 15 O 2 (g) 12 CO 2 (g) + 6 H 2 O (l) A. 55.9 g B. 419 g C. 240 g D. 330 g E. 476 g * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 18
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Sulfuric acid dissolves aluminum metal according to the reaction: 2 Al (s) + 3 H 2 SO 4 (aq) Al 2 (SO 4 ) 3 (aq) + 3 H 2 (g) Suppose you want to dissolve an aluminum block with a mass of 15.2 g. a) What minimum mass of H 2 SO 4 (in grams) do you need? b) What mass of H 2 gas (in grams) does the complete reaction of the aluminum block produce? * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 19
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* SUMMARY: Limiting Reagent PRACTICE: 0.240 mol of octane is allowed to react with 0.700 mol of oxygen. Which is the limiting reactant? a. Octane b. Oxygen PRACTICE: 3H 2 (g) + N 2 (g) 2NH 3 (g) How many moles of NH 3 can be produced from 24.0 mol of H 2 and excess N 2 ? * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 20
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* PRACTICE: Iron metal reacts with bromine as follows: Fe(s) + Br 2 (g) FeBr 3 (s) How many moles of FeBr 3 are obtained when 4.6 mol of Br 2 reacts with excess Fe? (A) 2.30 mol (B) 3.07 mol (C) 4.60 mol (D) 6.90 mol (E) 9.2 mol PRACTICE: A mixture of 34.0 g of ammonia and 40.0 g of oxygen gas reacts according to the equation 4 NH 3 + 3 O 2 2 N 2 + 6 H 2 O Under these conditions, how many grams of H 2 O would be produced? a) 40.2 b) 53.6 c) 51.1 d) 45.0 e) none of the given answers is close i.e. within 5% of the correct answer * This review was not prepared by your professor or school and is neither approved nor endorsed by your college or university 21
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ECU - GENERAL CHEMISTRY I - PROF. SPUCHES ECU CHEM 1150 SPUCHES EXAM 2 REVIEW* SUMMARY: Percent Yield PRACTICE: Tetraphosphorus hexoxide is formed by the reaction of phosphorus with oxygen gas. If
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