Honors Chemistry Review – Chapter 12 (Stoichiometry)



CHAPTER 12 HOMEWORK PACKET How many moles of calcium are needed to react with 15.0g of nitric acid? What mass of lead(II) iodide will be produced by the reaction of 0.75g of lead(II) nitrate with excess potassium iodide solution? How many atoms of zinc are needed to react with 24.0L of oxygen at STP? Sodium chlorate decomposes to yield sodium chloride and oxygen. What mass of oxygen will from the decomposition of 16.0g of sodium chlorate if the reaction has a 88.5% yield?A certain lab procedure for the combustion of aluminum to aluminum oxide has a 73.2% yield. Determine the mass of aluminum needed to produce 2.44g of aluminum oxide. A student uses a different procedure to react aluminum with oxygen. He starts with 5.0g of aluminum, and produces 8.1g of aluminum oxide. Calculate his percent yield.361950966470Answers: 1) 0.119mol Ca2) 1.0g PbI23) 1.29 x 1024 atoms Zn4) 6.39g O25) 1.76g Al 6) 86%00Answers: 1) 0.119mol Ca2) 1.0g PbI23) 1.29 x 1024 atoms Zn4) 6.39g O25) 1.76g Al 6) 86%LIMITING REACTANT PRACTICE1. 250.0L of dinitrogen pentoxide, at STP, is bubbled through 2.500 kg of water. a. identify the limiting reactantb. predict the mass of product formed by the reactionc. determine the mass of the excess reactant that will remain following the reaction.2. 48.3g of pure nitrogen react with 26.0g of calciuma. identify the limiting reactant.b. predict the mass of product to be formed by the reaction.c. determine the mass of excess reactant. d. the excess reactant is then reacted with 42.0L of hydrogen at STP. What mass of NH3 will be formed? 3. Find the limiting reactant and the remaining volume of excess reactant when 750mL of butane gas (C4H10), at STP, are reacted with 2.0L of oxygen gas, also at STP.0337820Answers: 1a) N2O5 b) 1407g HNO3 c) 2299g H2O2a) Ca 2b) 32.1g Ca3N2 2c) 42.2gN2 2d) 51.4g NH33) O2 is limiting reactant; 0.44L C4H10 remain00Answers: 1a) N2O5 b) 1407g HNO3 c) 2299g H2O2a) Ca 2b) 32.1g Ca3N2 2c) 42.2gN2 2d) 51.4g NH33) O2 is limiting reactant; 0.44L C4H10 remainHonors Chemistry Practice – Chapter 12 (Stoichiometry)1. How many grams of nitrogen are required to react with 40.0 grams of hydrogen to produce ammonia?2. How many liters of air, at STP, (21% O2) are required to react with 132 grams of propane (C3H8)?3. If 2.50 grams of phosphorus react with 0.750 liters of oxygen at STP to produce diphosphorus pentoxide, how many grams of product will form?4. How many grams of an 87.60% HCl solution would be required to neutralize 5.660 grams of aluminum hydroxide?5. If 96.1 grams of magnesium react with excess oxygen to produce 145 grams of magnesium oxide, what was the percent yield?6. If 66.8 grams of calcium bromide react with 9.96 liters of chlorine at STP, how many grams of bromine will result if the reaction has a 67.0% yield?7. How much magnesium hydroxide can be neutralized by the chloric acid that remains after 7.25 grams of calcium react with 212 grams of chloric acid?-9525183515Answers: 1) 185g N22) 1600L air3) 1.90g P2O54) 9.059g solution 5) 91.0% yield6) 35.8g Br27) 62.7g Mg(OH)200Answers: 1) 185g N22) 1600L air3) 1.90g P2O54) 9.059g solution 5) 91.0% yield6) 35.8g Br27) 62.7g Mg(OH)2CHAPTER 12 - MORE PRACTICE1. How many grams of aluminum are required to completely react with 55.0 grams of oxygen?2. If 5.00 grams of copper reacts with a solution of 20.0 grams of silver nitrate, which is the limiting reactant? (a copper II compound if formed in this reaction)3. If excess sulfuric acid reacts with 30.0 grams of sodium chloride, how many grams of hydrogen chloride are produced?4. In the combustion of propane (C3H8), 18.5 grams of carbon dioxide are produced. The reaction has only an 89.3% yield. How many grams of propane were originally burned?5. Hydrazine, N2H4, is used as rocket fuel. It reacts with oxygen to form nitrogen and water.a) How many grams of nitrogen gas is formed when 1200 grams of oxygen reacts with 1.0 kilograms of N2H4?b) How many grams of excess reactant remains after the reaction?6. When 50.0 grams of silicon dioxide is heated with excess carbon, 32.2 grams of silicon carbide is produced.SiO2 + 3 C SiC + 2 COa) What is the percent yield of this reaction?b) How many grams of carbon monoxide are produced?7. The pollutant sulfur dioxide can be removed from the emissions of an industrial plant by reacting it with calcium carbonate and oxygen.2CaCO3 + 2SO2 + O2 2CaSO4 + 2CO2If this reaction proceeds with a 96.8% yield, how many kilograms of calcium sulfate are formed when 5.24 kilograms of sulfur dioxide reacts with excess calcium carbonate and oxygen?8. 100.0 grams of a 30.0% solution of nitric acid (gfm=63.02 g/mol) reacts with 10.0 grams of magnesium hydroxide (gfm=58.33 g/mol). The excess from this reaction will be used to react with zinc. How many grams of zinc will completely react with the excess reactant?Answers: 1) 61.9 g 2) AgNO3 is limiting 3) 18.7 g 4) 6.92 g 5) a) 870 g b) 200 g excess O2 6) a) 96.4% b) 44.9 g 7) 10.8 kg8) 4.36 g Honors Chemistry Extra Practice Worksheet – Stoichiometry1. How many moles of oxygen are consumed when 96.7 moles of hydrogen sulfide gas are burned, producing sulfur dioxide and water vapor in the process?2. If 3.70 x 1023 molecules of oxygen react with excess benzene (C6H6), how many grams of water can be produced?3. How many grams of potassium chloride are produced by the decomposition of 4.90 grams of potassium chlorate? (the other product is oxygen)4. How many grams of aluminum oxide are produced when 17.9 moles of oxygen react with excess aluminum?5. How many moles of aluminum oxide are formed when a mixture of 0.360 moles of aluminum and 0.360 moles of oxygen are ignited?6. What mass of sulfur trioxide will be produced when 25.0 grams of sulfur dioxide react with 6.00 grams of oxygen?7. What reactant will be in excess, and by how much, when 145.5 grams of sodium oxide reacts with 2.93 moles of carbon dioxide to form sodium carbonate?8. When 10.0 grams of silicon react with 100.0 grams of oxygen, how many grams of silicon dioxide is formed? Which reactant is in excess and by how much?9. 30.0 grams of acetic acid reacts with excess methanol (CH3OH) to produce 30.0 grams of methyl acetate (CH3COOCH3) and water. Determine the percent yield of the reaction.10. How many grams of zinc chloride solution are required to completely react with 15.0 grams of lithium? The zinc chloride solution is 8.00% zinc chloride by mass.11. A 30.0% calcium chloride solution has a mass of 50.0 grams. This solution reacts with 35.0 grams of silver nitrate. Determine the excess reactant and the grams of it that remains, the moles of precipitate that form, and the grams of the other product formed.12. How much sodium hydroxide can be neutralized by the hydrochloric acid that remains after 38.75 grams of aluminum react with 325.0 grams of hydrochloric acid?13. A chemist reacts 2.00 grams of vanadium II oxide with 5.75 grams of iron III oxide to produce vanadium V oxide and iron II oxide. The reaction goes to 67.0% completion. How many grams of the iron II oxide are produced?center0Answers: 1) 145 mol O22) 4.43g H2O3) 2.98g KCl4) 1220g Al2O35) 0.180mol Al2O36) 30.0g SO3 7) 25.7g CO2 excess8) 21.4g SiO2; 88.6g O2 excess9) 81.1%10) 1840g ZnCl211) 0.206 mol AgCl; 3.6g CaCl2 excess; 16.9g Ca(NO3)212) 184.2g NaOH13) 3.46g FeO020000Answers: 1) 145 mol O22) 4.43g H2O3) 2.98g KCl4) 1220g Al2O35) 0.180mol Al2O36) 30.0g SO3 7) 25.7g CO2 excess8) 21.4g SiO2; 88.6g O2 excess9) 81.1%10) 1840g ZnCl211) 0.206 mol AgCl; 3.6g CaCl2 excess; 16.9g Ca(NO3)212) 184.2g NaOH13) 3.46g FeO ................
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