Q More than Trillion Exercises CLASS COPY M oles to Parficles (atoms or molecules) Worksheet 1. How many molecules are in 2.00 moles of H2O? 2. How many moles are in 8.30 X 1023 molecules of H2O? 3. How many molecules are in 0.500 moles of H2? 4. How many atoms are in 1.00 moles of He? 5. How many atoms are in 1.50 moles of Hg? 6. How many molecules are in 2.50 moles of O2? 7. How many atoms are in 0.250 moles of Rb? 8. How many moles are in 2.91 X 1022 atoms of He? 9. How many moles are in 1.23 X 1050 molecules of H2? 10. How many moles are in 5.25 X 1025 atoms of Au? 11. How many moles are in 7.14 X 1035 molecules of O2? 12. How many moles are in 8.11 X 1020 molecules of CH4? 1) How many moles are in 40.0 grams of water? 2) How many grams are in 3.7 moles of Na2O? 3) How many atoms are in 14 moles of cadmium? 4) How many moles are in 4.3 x 1022 molecules of H3PO4? 5) How many molecules are in 48.0 grams of NaOH? 6) How many grams are in 4.63 x 1024 molecules of CCl4? Everett Community College Tutoring Center Student Support Services Program Stoichiometry Worksheet and Key 2 KClO3 ? 2 KCl + 3 O2 1. How many moles of O2 will be formed from 1.65 moles of KClO3? 1 = mol O2 2. How many moles of KClO3 are needed to make 3.50 moles of KCl? = mol KClO3 3. How many moles of KCl will be formed from 2.73 moles of KClO3? = 4 Fe + 3 O2 ? 2 Fe2O3 4. How many moles of Fe2O3 are produced when 0.275 moles of Fe is reacted? = mol Fe2O3 5. How many moles of Fe2O3 are produced when 31.0 moles of O2 is reacted? = 6. How many moles of O2 are needed to react with 8.9 moles of Fe? = 2 H2O ? 2 H2 + O2 7. How many moles of O2 are produced when 1.26 moles of H2O is reacted? 8. How many moles of H2O are needed to produce 55.7 moles of H2? 9. If enough H2O is reacted to produce 3.40 moles of H2, then how may moles of O2 must have been made? (a bit challenging, but just think about it and you can probably figure it out) 2 KClO3 ? 2 KCl + 3 O2 10. How many grams of O2 will be formed from 3.76 grams of KClO3? 3 = g O2 11. How many grams of KClO3 are needed to make 30.0 grams of KCl? 3 = 12. How many grams of KCl will be formed from 2.73 g of KClO3? 2 = 4 Fe + 3 O2 ? 2 Fe2O3 13. How many grams of Fe2O3 are produced when 42.7 grams of Fe is reacted? 4 = 14. How many grams of Fe2O3 are produced when 17.0 grams of O2 is reacted? 1 = 15. How many grams of O2 are needed to react with 125 grams of Fe? = Some cars can use butane (C4H10) as fuel: 2 C4H10 + 13 O2 ? 8 CO2 + 10 H2O g KClO3 g KCl g Fe2O3 g Fe2O3 16. How many grams of CO2 are produced from the combustion of 100. grams of butane? 1 = g CO2 17. How many grams of O2 are needed to react with of 100. grams of butane? 1 = 18 How many grams of H2O are produced when 5.38g of O2 is reacted? g O2 Name Limiting Reagent Worksheet 1) When copper (II) chloride reacts with sodium nitrate, copper (II) nitrate and sodium chloride are formed. a) Write the balanced equation for the reaction given above: b) If 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? c) What is the limiting reagent for the reaction in #2? d) How many grams of copper(II) nitrate is formed? e) How much of the excess reagent is left over in this reaction? f) If 11.3 grams of sodium chloride are formed in the reaction described in problem #2, what is the percent yield of this reaction? 2) When lead (II) nitrate reacts with sodium iodide, sodium nitrate and lead (II) iodide are formed. a) Balance the equation: b) If I start with 25.0 grams of lead (II) nitrate and 15.0 grams of sodium iodide, how many grams of sodium nitrate can be formed? c) What is the limiting reagent in the reaction described in problem 2? d) How many grams of lead(II) iodide is formed? e) How much of the nonlimiting reagent will be left over from the reaction in problem #2? f) If 6 grams of sodium nit are formed in the reaction described in problem #2, what is the percent yield of this reaction? 3) 1000 grams of sodium chloride is combined with 2000 grams of barium phosphate. a) Balance the equation: b) What is the limiting reactant? c) How many grams of excess reactant are left? 4) A chemist burns 160.0 g of Al in excess air to produce aluminum oxide, Al2O3. She produces 260.0 g of solid aluminum oxide. Write a balanced equation for the reaction. a) Determine the theoretical yield. b) Determine the percent yield. 5) 4000 grams of heptane (C7H16) is combusted with 7000 grams of oxygen to produce carbon dioxide and water. a) What is the limiting reactant? b) How many grams of carbon dioxide are produced? c) How many grams of excess reactant are left? 6) In the reaction of Zn with HCl, 140.15 g of ZnCl2 was actually formed, although the theoretical yield was 143 g. What was the percent yield? 7) 12.5 g of copper are reacted with an excess of chlorine gas, and 25.4 g of copper(II) chloride are obtained. Calculate the theoretical yield and the percent yield. 8) In the reaction of Zn with HCl, 140.15 g of ZnCl2 was actually formed, although the theoretical yield was 143 g. What was the percent yield? Worksheet: Percent Yield Name 1. Chlorobenzene, C6H5Cl, is used in the production of chemicals such as aspirin and dyes. One way that chlorobenzene is prepared is by reacting benzene, C6H6, with chlorine gas according to the following BALANCED equation. C6H6 (l) + Cl2 (g) ? C6H5Cl (s) + HCl (g) a. What is the theoretical yield if 45.6 g of benzene react? b. If the actual yield is 63.7 g of chlorobenzene, calculate the percent yield. 2. When carbon disulfide burns in the presence of oxygen, sulfur dioxide and carbon dioxide are produced according to the following equation. CS2 (l) + 3 O2 (g) ? CO2 (g) + 2 SO2 (g) a. What is the percent yield of sulfur dioxide if the burning of 25.0 g of carbon disulfide produces 40.5 g of sulfur dioxide? b. What is the percent yield of carbon dioxide if 2.5 mol of oxygen react and 32.4 g of carbon dioxide are produced? CHEMISTRY: A Study of Matter © 2004, GPB 8.22

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