Year 9 Extra Credit Assignment
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1 Complete the following problem by the Strategy: A. Balance the chemical equation for the reaction (see study guide. B. Use the given densities to convert from volume to mass. Then use each molar mass to convert from mass to moles. C. Using mole ratios, determine which substance is the limiting reactant. After identifying the limiting reactant, use mole ratios based on the number of moles of limiting reactant to determine the number of moles of product. D. Convert from moles of product to mass of product. 1. Ethyl acetate (C C C 2 is the solvent in many fingernail polish removers and is used to decaffeinate coffee beans and tea leaves. It is prepared by reacting ethanol (C 2 OH with acetic acid (C C H; the other product is water. A small amount of sulfuric acid is used to accelerate the reaction, but the sulfuric acid is not consumed and does not appear in the balanced chemical equation. Given 10.0 ml each of acetic acid and ethanol, how many grams of ethyl acetate can be prepared from this reaction? The densities of acetic acid and ethanol are g/ml and g/ml, respectively. Given: reactants, products, and volumes and densities of reactants Asked for: mass of product Percent Yield: Theoretical mass (calculated mass is the maximum amount of product that can be formed from the reactants. This is the amount you would obtain if the reaction occurred perfectly and your method of purifying the product were 100% efficient. In reality, you almost always obtain less product than is theoretically possible because of mechanical losses (such as spilling, separation procedures that are not 100% efficient, competing reactions that form undesired products, and reactions that simply do not go all the way to completion, thus resulting in a mixture of products and reactants. So the actual yield, the measured mass of products obtained from a reaction, is almost always less than the theoretical yield (often much less. The percent yield of a reaction is the ratio of the actual yield to the theoretical yield, multiplied by 100 to give a percentage. Limiting Reactants: When reactions do not go all the way to completion, sometimes one reactant is responsible for restricting the amount of product obtained. This is called the Limiting Reactant.
2 Finding the Limiting Reagent. Given the following Balanced Chemical Equation. N 2 (g + 3H 2 (g 2N (g Similar to calculating percent yield, the coefficients provide a theoretical mole ratio. In reality, the mass of reactants do not exactly match the relative masses of the reactants calculated from the Balanced Chemical Equation. Some reactant may be in excess (or left over after the reaction goes to completion (see N 2 below. The reactant that gets used up is the Limiting Reactant. Complete the following problems by the Strategy: A. Write the balanced chemical equation. B. Convert from mass of reactants and product to moles using molar masses and then use mole ratios to determine which is the limiting reactant. Based on the number of moles of the limiting reactant, use mole ratios to determine the theoretical yield. C. Calculate the percent yield by dividing the actual yield by the theoretical yield and multiplying by Procaine is a key component of Novocain, an injectable local anesthetic used in dental work and minor surgery. Procaine can be prepared in the presence of H 2 (indicated above the arrow by the reaction. p-aminobenzoic acid 2-diethylaminoethanol H 2 C 7 H 7 N + C 6 H 15 N C 13 H 20 N 2 + H 2 O procaine If we carried out this reaction using 10.0 g of p-aminobenzoic acid and 10.0 g of 2-diethylaminoethanol, and we isolated 15.7 g of procaine, what was the percent yield? Given: masses of reactants and product Asked for: percent yield
3 3. Lead (Pb was one of the earliest metals to be isolated in pure form. It occurs as concentrated deposits of a distinctive ore called galena (PbS, which is easily converted to lead oxide (PbO in 100% yield by roasting in air via the following reaction: 2PbS(s + 3 (g 2PbO(s + 2S (g The resulting PbO is then converted to the pure metal by reaction with charcoal. Because lead has such a low melting point (327 C, it runs out of the ore-charcoal mixture as a liquid that is easily collected. The reaction for the conversion of lead oxide to pure lead is as follows: PbO(s + C(s Pb(l + CO(g If 93.3 kg of PbO is heated with excess charcoal and 77.3 kg of pure lead is obtained, what is the percent yield? Write a balanced chemical equation for each reaction and then determine which reactant is in excess (See Study Guide g barium(s (Ba plus 3.89 g bromine(l (Br in water to give barium bromide (BaBr g bromine(l (Br plus (+.42 g potassium iodide(s (KI in water to give potassium bromide (KBr and iodine (I g of zinc (Zn metal plus 3.62 g of sulfuric acid (H 2 in water to give zinc sulfate (Zn and hydrogen gas (H g of iron metal (Fe reacts with g of silver acetate (AgC 2 in water to give iron(ii acetate (Fe(C 2 and silver metal (Ag g of ammonium phosphate ((NH₄₃PO₄ reacts with g of barium hydroxide (Ba(OH in water to give ammonium hydroxide (NH 4 OH and barium phosphate (Ba 3 Under the proper conditions, ammonia (N and oxygen ( will react to form dinitrogen monoxide (N 2 O, nitrous oxide, also called laughing gas and water. Write a balanced chemical equation for this reaction. Determine which reactant is in excess for each combination of reactants g of ammonia and 21.4 g of oxygen mol of ammonia and 84.2 g of oxygen molecules of ammonia and 318 g of oxygen
4 mol of ammonia and 36.4 g of oxygen When a piece of zinc metal is placed in aqueous hydrochloric acid (HCl, zinc chloride (ZnCl is produced, and hydrogen gas (H 2 is evolved. Write a balanced chemical equation for this reaction. Determine which reactant is in excess for each combination of reactants g of HCl and 7.3 g of Zn mol of HCl and 100 g of Zn molecules of Zn and 26.0 g of HCl mol of Zn and 97.4 g of HCl Determine the mass of each reactant needed to give the indicated amount of product. Be sure that the chemical equations are balanced. 17. NaI(aq + Cl 2 (g NaCl(aq + I 2 (s; 1.0 mol of NaCl 18. NaCl(aq + H 2 (aq HCl(g + Na 2 (aq; 0.50 mol of HCl 19. N (g + H 2 O(l HN (aq + HNO 3 (aq; 1.5 mol of HNO 3 Determine the mass of each reactant needed to give the indicated amount of product. Be sure that the chemical equations are balanced. 20. AgNO 3 (aq + CaCl 2 (s AgCl(s + Ca(NO 3 (aq; 1.25 mol of AgCl 21. Pb(s + Pb (s + H 2 (aq Pb (s + H 2 O(l; 3.8 g of Pb 22. PO 4 (aq + MgCO 3 (s Mg 3 (s + C (g + H 2 O(l; 6.41 g of Mg 3 Determine the percent yield of each reaction. Be sure that the chemical equations are balanced. Assume that any reactants for which amounts are not given are in excess. (The symbol Δ indicates that the reactants are heated. Δ 23. KClO 3 (s KCl(s+ (g; 2.14 g of KClO 3 produces 0.67 g of 24. Cu(s + H 2 (aq Cu (aq + S (g + H 2 O(l; 4.00 g of copper gives 1.2 g of sulfur dioxide 25. AgC 2 (aq + Na 3 PO 4 (aq Ag 3 PO 4 (s + NaC 2 (aq; g of silver acetate produces g of silver phosphate Each step of a four-step reaction has a yield of 95%. 26. What is the percent yield for the overall reaction?
5 A three-step reaction yields of 87% for the first step, 94% for the second, and 55% for the third. 27. What is the percent yield of the overall reaction? 28. Give a general expression relating the theoretical yield (in grams of product that can be obtained from x grams of B, assuming neither A nor B is limiting. A + 3B 2C Under certain conditions, the reaction of hydrogen with carbon monoxide (CO can produce methanol (C OH. 29. Write a balanced chemical equation for this reaction. 30. Calculate the percent yield if exactly 200 g of methanol is produced from exactly 300 g of carbon monoxide. Chlorine dioxide (ClO₂ is a bleaching agent used in the paper industry. It can be prepared by the following reaction: NaCl (s + Cl 2 (g Cl (aq + NaCl(aq 31. What mass of chlorine is needed for the complete reaction of 30.5 g of NaCl? 32. Give a general equation for the conversion of x grams of sodium chlorite to chlorine dioxide. The reaction of propane gas (C CH 2 C with chlorine gas (Cl 2 produces two monochloride products: C CH 2 CH 2 Cl and C CHClC. The first is obtained in a 43% yield and the second in a 57% yield. 33. If you use 2.78 g of propane gas, how much chlorine gas would you need for the reaction to go to completion? 34. How many grams of each product could theoretically be obtained from the reaction starting with 2.78 g of propane? 35. Use the actual percent yield to calculate how many grams of each product would actually be obtained.
6 Protactinium (Pa, a highly toxic metal, is one of the rarest and most expensive elements. The following reaction is one method for preparing protactinium metal under relatively extreme conditions: Δ 2PaI 5 (s 2Pa(s + 5I 2 (s 36. Given 15.8 mg of reactant, how many milligrams of protactinium could be synthesized? 37. If 3.4 mg of Pa was obtained, what was the percent yield of this reaction? 38. If you obtained 3.4 mg of Pa and the percent yield was 78.6%, how many grams of PaI 5 were used in the preparation? Aniline (C 6 NH 2 can be produced from chlorobenzene (C 6 Cl via the following reaction: C 6 Cl(l + 2N (g C 6 NH 2 (l + NH 4 Cl(s Assume that 20.0 g of chlorobenzene at 92% purity is mixed with 8.30 g of ammonia. 39. Which is the limiting reactant? 40. Which reactant is present in excess? 41. What is the theoretical yield of ammonium chloride in grams? 42. If 4.78 g of NH 4 Cl was recovered, what was the percent yield? 43. Derive a general expression for the theoretical yield of ammonium chloride in terms of grams of chlorobenzene reactant, if ammonia is present in excess. A stoichiometric quantity of chlorine gas is added to an aqueous solution of NaBr to produce an aqueous solution of sodium chloride and liquid bromine. Write the chemical equation for this reaction. Then assume an 89% yield and calculate the mass of chlorine given the following: formula units of NaCl mol of Br g of NaCl
7 CONCEPTUAL PROBLEMS (Full sentence answers 47. Engineers use conservation of mass, called a mass balance, to determine the amount of product that can be obtained from a chemical reaction. Mass balance assumes that the total mass of reactants is equal to the total mass of products. Is this a chemically valid practice? Explain your answer. 48. Given the equation 2H 2 (g + (g 2H 2 O(g, is it correct to say that 10 g of hydrogen will react with 10 g of oxygen to produce 20 g of water vapor? 49. What does it mean to say that a reaction is stoichiometric? 50. When sulfur is burned in air to produce sulfur dioxide, what is the limiting reactant? Explain your answer. 51. Is it possible for the percent yield to be greater than the theoretical yield? Justify your answer. Formula Key: ammonium chloride : NH 4 Cl sodium cyanide : NaCN magnesium hydroxide : Mg(OH calcium phosphate : Ca 3 lithium carbonate : Li 2 CO 3 hydrogen sulfite ion : HSO 3 potassium permanganate : KMnO 4 sodium sulfate : Na 2 hydrogen cyanide : HCN potassium thiocyanate: KSCN ammonium oxalate : (NH 4 C 2 O 4 lithium acetate : C 2 Li chlorine gas : Cl 2 silver nitrate : AgNO 3 aluminum chloride : AlCl 3 calcium carbonate : CaCO 3 Iron (II Sulfide : FeS dinitrogen pentoxide : N 2 O 5 lead(ii nitrate : Pb(NO 3 ammonium phosphate : (NH 4 3 PO 4 Sulfuric acid : H 2 potassium dichromate : K 2 Cr 2 O 7 Ethyl acetate : C C C 2 Ethanol : (C 2 OH Acetic acid : (C C H Procaine : (C 13 H 20 N 2
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