Stoichiometry. Homework EC. cincochem.pbworks.com. Academic Chemistry DATE ASSIGNMENT
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1 Unit 10 Resournces Name Academic Chemistry Stoichiometry Homework On-Time LATE DATE ASSIGNMENT EC 16 cincochem.pbworks.com Stoichiometry Live in the now. Garth Algar cincochem.pbworks.com
2 WARMUP WARMUP 2 Day 1 Day 6 Day 2 Day 7 Day 3 Day 8 Day 4 Day 9 Day 5 Day 10 Stoichiometry cincochem.pbworks.com 2 Stoichiometry cincochem.pbworks.com 15
3 Limiting Reactant / Percent Yield HW 10.6 PERCENT YIELD Ba(NO 3 ) 2 + Na 2 SO 4 BaSO 4 + NaNO 3 HW Complete the chart. Intro to Stoichiometry Mole Conversions A chemist began with 75 g of Ba(NO 3 ) 2. After collecting and drying the product, g of BaSO 4 was obtained. 5. What was the actual yield of BaSO 4? N 2 + H 2 NH 3 Conserved? Atoms + 6. What is the theoretical yield of BaSO 4? Mass + Moles + 7. What is the percent yield of BaSO 4? Molecules + 2. Balance the following equation C 4 H 8 + O 2 CO 2 + H 2 O A chemist began with 150 g of Na 2 SO 4. After collecting and drying the product, g of NaNO 3 was obtained. Complete the following mole ratios 8. What was the actual yield of NaNO 3? 9. What is the theoretical yield of NaNO 3? C 4 H 8 O 2 O 2 C 4 H 8 C 4 H 8 O 2 CO 2 H 2 O CO 2 H 2 O Balance the reaction, answer the questions that follow. Use dimensional analysis, show units, and show work. 3. C (s) + SO 2 (g) CS 2 (l) + CO (g) 10. What is the percent yield of NaNO 3? a. How many moles of CS 2 form when 4.8 moles of solid carbon reacts with sulfur dioxide? 14 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 3
4 Intro to Stoichiometry Mole Conversions HW 10.1 b. How many moles of SO 2 are needed to form 3.7 moles of CO? HW 10.6 Limiting Reactant / Percent Yield Balance the reaction, answer the questions that follow. Use dimensional analysis, show units, and show work. LIMITING REACTANT S + O 2 SO 2 1. If 5.0 grams of S and 8.0 grams of O 2 are used to produce SO 2, which is the limiting reactant? c. How many moles of C are needed to react with 9.2 moles of SO 2? 2. If 24.0 grams of S and 15.0 grams of O 2 are used to produce SO 2, which is the limiting reactant? 4. KClO 3 KCl + O 2 a. How many moles of potassium chloride (KCl) are formed when 12.2 moles of potassium chlorate (KClO 3 ) decompose? _2_KMnO 4 + _1_H 2 SO 4 _1_K 2 SO 4 + _1_Mn 2 O 7 + _1_ H 2 O 3. If 500 grams of KMnO 4 and 200 grams of H 2 SO 4 are used to produce K 2 SO 4, which is the limiting reactant? b. How many moles of oxygen gas are formed when 2.9 moles of KCl are formed? 4. If 400 grams of KMnO 4 and 700 grams of H 2 SO 4 are used to produce Mn 2 O 7, which is the limiting reactant? 4 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 13
5 Mixed Stoichiometry HW 10.5 BaO + H 2 SO 4 BaSO 4 + H 2 O 5. How many molecules of barium sulfate (BaSO 4 ) can be formed from 196 grams of H 2 SO 4? HW 10.2 Mass Conversions Using the below reaction, answer questions 1 and 2. Use dimensional analysis, show units, and show work. K + Cl 2 KCl 1. How many grams of KCl are produced from 2.5 grams of potassium? (Hint: balance reaction, calculate molar mass of each substance) _2_KMnO 4 + _1_ H 2 SO 4 _1_ K 2 SO 4 + _1_ Mn 2 O 7 + _1_ H 2 O 6. How many moles of Mn 2 O 7 can be produced from 196 grams of KMnO 4? 2. How many grams of KCl are produced from 1.0 gram of chlorine gas, Cl 2? 7. How many liters of Mn 2 O 7 can be produced from 390 grams of KMnO 4? Using the below reaction, answer questions 3 and 4. Use dimensional analysis, show units, and show work. Fe + S 8 FeS 3. The most common form (allotrope) of sulfur found in nature is α-cyclo-octosulfur, S 8. What mass of iron is needed to react with 16 grams of sulfur (S 8 ) in this form? 8. How many grams of H 2 SO 4 are needed to produce 2.70 x molecules of water? 4. How many grams of FeS will be produced from 16 grams of sulfur (S 8 )? 12 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 5
6 Mass Conversions HW 10.2 Using the below reaction, answer questions 5 and 6. Use dimensional analysis, show units, and show work. HW 10.5 Mixed Stoichiometry Balance the reaction, answer the questions that follow. Use dimensional analysis, show units, and show work. NaOH + Al Na 3 AlO 3 + H 2 NaClO 3 NaCl + O 2 1. How much aluminum (in grams) is required to produce 17.5 grams of hydrogen? 5. Sodium chlorate (NaClO 3 ) is a weed killer powder that can ignite at temperatures over 250 C. If 12 grams of NaClO 3 is decomposed in an open flame, how many grams of oxygen gas will be produced? MgCl 2 Mg + Cl 2 2. When 2.3 x atoms of magnesium are decomposed, how many liters of chlorine gas are produced? 6. If 32 grams of sodium chloride, NaCl, are produced, how many grams of oxygen gas will also be produced? Al + Cl 2 AlCl 3 3. When 3.5 liters of chlorine gas are added to aluminum metal, how many grams of aluminum chloride are produced? Ag 2 S Ag + S 4. What mass of silver is produced by the decomposition of 75 grams of silver sulfide? 6 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 11
7 Gas Stoichiometry HW 10.4 SO 2 + O 2 SO 3 HW 10.3 Molar Volume of a Gas 1. How many liters are in 34.5 moles of CO 2 (g) at STP? 5. How many liters of oxygen must be available to convert 50 liters of sulfur dioxide (SO 2 ) to sulfur trioxide (SO 3 )? 2. How many liters are in 12.5 moles of H 2 (g) at STP? 6. How many liters of sulfur trioxide will be produced by oxidizing 10 liters of sulfur dioxide? 3. How many moles are in 22.4 L of NH 3 (g) at STP? CuO + H 2 Cu + H 2 O 7. If 250 liters of hydrogen are used to reduce copper (II) oxide at STP, what mass of copper will be formed? 4. How many moles are in 1000 L of H 2 O (g) at STP? 10 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 7
8 Molar Volume of a Gas HW How many liters are in 100 g of O 2 (g) at STP? HW 10.4 Gas Stoichiometry Balance the reaction, answer the questions that follow. Use dimensional analysis, show units, and show work. H 2 + Cl 2 HCl 1. How many liters of hydrogen gas are needed to react completely with 50.0 liters of chlorine gas? 6. How many liters are in 535 g of NH 3 (g) at STP? 2. How many liters of hydrochloric acid are produced in this reaction using 50.0 liters of chlorine gas? 7. How many grams are in 15 L of O 2 (g) at STP? N 2 + H 2 NH 3 3. If 200 liters of ammonia (NH 3 ) are produced in this reaction, how many liters of nitrogen gas are used? 8. How many grams are in 27 L of N 2 O 4 (g) at STP? 4. If 200 liters of ammonia (NH 3 ) are produced in this reaction, how many liters of hydrogen gas are used? 8 cincochem.pbworks.com Stoichiometry Stoichiometry cincochem.pbworks.com 9
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