# Stoichiometry. 1. The total number of moles represented by 20 grams of calcium carbonate is (1) 1; (2) 2; (3) 0.1; (4) 0.2.

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1 Stoichiometry 1 The total number of moles represented by 20 grams of calcium carbonate is (1) 1; (2) 2; (3) 01; (4) 02 2 A 44 gram sample of a hydrate was heated until the water of hydration was driven off The anhydrous compound remaining had a mass of 33 grams What is the percentage by mass of water in the hydrate? (1) 25%; (2) 33%; (3) 67%; (4) 75% 3 A sample of neon gas at STP has a mass of 20 grams An equal volume of argon gas at STP will have a mass of (1) 10 g; (2) 20 g; (3) 30 g; (4) 40 g 4 Given the reaction: 2KClO 3 = 2KCl + 3O 2 What is the total number of moles of KCl produced when 150 moles of potassium chlorate is decomposed? (1) 150; (2) 450; (3) 300; (4) What is the freezing point of a solution that contains 100 mole of a nonelectrolyte dissolved in 1000 grams of water? (1) 000 C; (2) 0520 C; (3) -186 C; (4) -372 C 6 If 500 cubic centimeters of 20M HCl is diluted with water to a volume of 1000 cubic centimeters then the molarity of the new solution will be (1) 10M; (2) 20M; (3) 025M; (4) 050M 7 A compound was found by analysis to consist of 856% carbon and 144% hydrogen What is its empirical formula? (1) CH; (2) CH 2 ; (3) C 2 H; (4) C 2 H 2 8 Given the reaction: N 2 (g) + 3H 2 (g) > 2NH 3 (g) How many liters of ammonia, measured at STP, are produced when 280 grams of nitrogen are completely consumed? (1) 560; (2) 112; (3) 224; (4) The number of moles in 10 grams of calcium is equal to (1) 025; (2) 050; (3) 10; (4) What is the molecular mass of a gas whose density is 125 grams per liter at STP? (1) 140; (2) 179; (3) 200; (4) Given the reaction: Zn + 2HCl > ZnCl2 + H2 How many moles of magnesium will be formed when 4 moles of HCl are consumed? (1) 6; (2) 2; (3) 8; (4) 4 12 One mole of (NH 4 ) 2 SO 4 has a mass in grams of (1) 50; (2) 54; (3) 64; (4) Which sample of neon contains a total of 1/2 mole of molecules at STP? (1) 112 l; (2) 224 l; (3) 200 g; (4) 400 g 14 A 15 gram sample of a gas has a volume of 30 liters at STP What is the density of the gas? (1) 30 g/l; (2) 20 g/l; (3) 15 g/l; (4) 050 g/l 15 Ca(OH) 2 (formula mass = 74) has a percent by mass that is closest to (1) 16; (2) 22; (3) 43; (4) 74 Stoichiometry page 1 of 8

2 16 The empirical formula of a compound is CH Its molecular mass could be (1) 21; (2) 40; (3) 51; (4) Which 10 liter sample has the greatest mass at STP? (3) Cl 2 (g); (4) CH 4 (g) (1) H 2 (g); (2) CO 2 (g); 18 Given the reaction: N 2 (g) + O 2 (g) = 2NO(g) What is the total number of liters of NO(g) produced when 20 liters of nitrogen reacts completely with oxygen? (1) 10; (2) 20; (3) 050; (4) What is the molarity of a solution that contains 112 grams of KOH in 200 liters of solution? (1) 100 M; (2) 200 M; (3) 300 M; (4) 400 M 20 A compound consists of 85% silver and 15% fluorine by mass What is its empirical formula? (1) AgF; (2) AgF2; (3) Ag2F; (4) Ag6F 21 One mole of an ideal gas occupies a volume of 224 liters at (1) 273 K and 760 mm; (2) 273 K and 0 mm; (3) 760 degrees C and 273 mm; (4) 0 degrees C and 273 mm 22 If NO 2 is the empirical formula of a compound whose molecular mass is 92, then what is its molecular formula? (1) NO 2 ; (2) N 2 O 4 ; (3) N 3 O 6 ; (4) N 4 O 8 23 Given the reaction: 2H 2 + O > 2H 2 O In the above reaction the total number of grams of oxygen needed to produce 54 grams of water is (1) 36; (2) 48; (3) 61; (4) There is one mole in a sample of (1) 14 g of Li; (2) 14 g of N 2 ; (3) 40 g of He; (4) 40 g of H 2 25 A solution that has 20 grams of calcium bromide in a 050 liter of solution has a molarity of (1) 050; (2) 020; (3) 50; (4) The percent by mass of oxygen in MgO (formula mass = 40) is closest to (1) 16%; (2) 24%; (3) 40%; (4) 60% 27 A compound consists of 146% carbon and 855% chlorine by mass What is the empirical formula? (1) CCl; (2) CCl 2 ; (3) CCl 3 ; (4) CCl 4 28 The gram-molecular mass of a gas is 56 grams Its density at STP in grams per liter is (1) 10; (2) 56; (3) 25; (4) What is the volume of 025 mole of oxygen at STP? (1) 025 liter; (2) 050 liter; (3) 56 liters; (4) 112 liters 30 CH 2 is the empirical formula of a compound with a molecular mass of 42 What is the molecular formula of the compound? (1) CH 2 ; (2) C 2 H 4 ; (3) C 3 ; (4) C 4 H 8 31 The percent by mass of Li in LiNO 3 (formula mass = 69) is closest to (1) 6%; (2) 10%; (3) 18%; (4) 20% 32 Which gas is most dense at STP? (1) CO(g); (2) N 2 (g); (3) NO(g); (4) O 2 (g) 33 A compound contains 050 mole of carbon for each 10 mole of hydrogen The Stoichiometry page 2 of 8

3 empirical formula of this compound is (1) CH; (2) CH 2 ; (3) C 2 H; (4) C 2 H 2 34 What is the molarity of a solution that contains 28 grams of KOH (formula mass = 56) in 20 liters of solution? (1) 10 M; (2) 20 M; (3) 025 M; (4) 050 M 35 Given the reaction: S + O 2 = SO 2 What is the total number of grams of oxygen needed to react completely with 20 moles of sulfur? (1) 20; (2) 32; (3) 64; (4) A 220 gram sample of a gas occupies 112 liters at STP What is the gram molecular mass of the gas? (1) 112 g; (2) 224 g; (3) 220 g; (4) 440 g 37 A 38 gram sample of F 2 contains about the same number of molecules as (1) 14 g of N 2 ; (2) 20 g of H 2 ; (3) 36 g of H 2 O; (4) 40 g of Ne 38 Which compound contains the greatest percentage of oxygen by mass? (1) BaO; (2) CaO; (3) MgO; (4) SrO 39 Which gas is less dense than air at STP? (1) CO 2 ; (2) H 2 S; (3) NH 3 ; (4) SO 2 40 A compound contains 50% sulfur and 50% oxygen by mass The empirical formula of this compound is (1) SO; (2) SO 2 ; (3) SO 3 ; (4) SO 4 41 What is the total volume (in liters) occupied by 560 grams of nitrogen gas at STP? (1) 112; (2) 224; (3) 336; (4) Given the reaction: N2 + 3H2 = 2NH3 How many grams of ammonia are produced when 10 mole of nitrogen reacts? (1) 85; (2) 17; (3) 34; (4) Which gas has a greater density at STP than air at STP? (1) H 2 ; (2) NH 3 ; (3) Cl 2 ; (4) CH 4 44 Eleven grams of a gas occupies 56 liters at STP What is the molecular mass of this gas? (1) 11; (2) 22; (3) 44; (4) A compound which contains 75% carbon and 25% hydrogen by mass has the formula (1) CH 4 ; (2) C 2 H 2 ; (3) C 2 ; (4) C 3 H 8 46 Three moles of sulfur dioxide at 273 K and 380 mm will have a mass of (1) 64 grams; (2) 96 grams; (3) 192 grams; (4) 384 grams 47 The mass in grams of 200 moles of sulfur dioxide gas is (1) 480; (2) 640; (3) 800; (4) The empirical formula for a compound is CH If the molecular mass of this compound is 78 grams then the molecular formula of the compound is (1) CH; (2) C 2 H 2 ; (3) C 5 H 18 ; (4) C 6 49 The percentage of hydrogen in hydrogen sulfide is approximately (1) 1; (2) 2; (3) 6; (4) The density of a gas at STP is 126 grams per liter What is the molecular mass of this gas in grams per mole? (1) 126; (2) 602; (3) 178; (4) 282 Stoichiometry page 3 of 8

4 51 One liter of a solution of nitric acid contains 126 grams of solute The molarity of the solution is (1) 100; (2) 200; (3) 126; (4) What is the mass in grams of 56 liters of neon gas at STP? (1) 5; (2) 10; (3) 15; (4) A 500 ml solution contains 10 grams of NaOH The molarity of this solution is (1) 10 M; (2) 050 M; (3) 025 M; (4) 010 M 54 Nitrogen dioxide has a mass of 460 grams per mole At STP its density would be approximately (1) 103 g/liter; (2) 205 g/liter; (3) 410 g/liter; (4) 230 g/liter 55 Cu(NO 3 ) 2 has a percentage by mass of (3) 256% oxygen; (4) 511% oxygen (1) 850% oxygen; (2) 170% oxygen; 56 Fourteen grams of a gas occupies 112 liters at STP This gas may be (1) carbon dioxide; (2) hydrogen sulfide; (3) hydrogen chloride; (4) nitrogen 57 A compound is found by analysis to consist of 5% hydrogen and 95% flourine What is its empirical formula? (1) HF; (2) H 2 F; (3) H 2 F 2 ; (4) H 3 F 58 Which gas is least dense at STP? (1) NO; (2) NH 3 ; (3) HCl; (4) H 2 S 59 What mass of NaOH (formula mass = 40g) is needed to prepare 500 ml of an 050 M solution? (1) 10 grams; (2) 20 grams; (3) 25 grams; (4) 40 grams 60 A compound contains carbon and hydrogen in the mole ratio 1 to 2 The molecular mass of this compound could be (1) 42; (2) 21; (3) 15; (4) When 200 grams of NaOH is dissolved in 500 ml of solution the concentration of this solution is (1) 10 M; (2) 050 M; (3) 20 M; (4) 40 M 62 Given the reaction: 2H 2 (g) + O 2 (g) = 2H 2 O(g) According to the above equation how many liters of oxygen will combine with 30 liters of hydrogen to produce water? (1) 112; (2) 60; (3) 30; (4) What is the volume of 400 moles of nitrogen gas at STP? (1) 112 l; (2) 224 1; (3) 448 l; (4) 896 l 64 What is the percent by mass of hydrogen in ammonia (formula mass = 170)? (1) 59%; (2) 176%; (3) 214%; (4) 824% 65 Which sample of oxygen gas contains a total of 05 moles at STP? (1) 100 mole; (2) 200 moles; (3) 160 grams; (4) 320 grams 66 Given the reaction: Ca(ClO 3 ) > CaCl 2 + O 2 When the equation is correctly balanced the coefficient in front of the oxygen will be (1) 1; (2) 2; (3) 3; (4) 4 67 If the density of gas X at STP is 100 gram per liter the mass of a mole of this gas is (1) 100 g; (2) 200 g; (3) 112 g; (4) 224 g 68 Given the reaction: N 2 (g) + 3H 2 (g) > 2NH 3 (g) How many liters of hydrogen are required to produce exactly 30 liters of ammonia? (1) 15; (2) 20; (3) 45; (4) 60 Stoichiometry page 4 of 8

5 69 Two moles of nitrogen gas are mixed with 3 moles of hydrogen gas at 273 K and placed in a 224 liter container The pressure of this mixture of gases is (1) 1 atm; (2) 5 atm; (3) 3 atm; (4) 6 atm 70 What is the ratio by mass of hydrogen to oxygen in water? (1) 1-2; (2) 2-1; (3) 1-8; (4) Given the reaction: C 2 H 4 + 3O > 2CO 2 + 2H 2 O How many liters of carbon dioxide are produced when 15 liters of oxygen are consumed? (1) 10; (2) 15; (3) 30; (4) The percentage by mass of hydrogen in NH 3 is equal to (1) 1/17 x 100; (2) 3/17 x 100; (3) 17/3 x 100; (4) 6/17 x The empirical formula of a compound is CH 4 The molecular formula of the compound could be (1) CH 4 ; (2) C 2 ; (3) C 3 H 8 ; (4) C 4 H What is the total number of molecules contained in 050 mole of O2 at STP? (1) 60 x ; (2) 45 x ; (3) 30 x ; (4) 15 x Which solution contains the greatest number of moles of solute? (1) 05 L of 05 M; (2) 05 L of 2 M; (3) 2 L of 05 M; (4) 2 L of 2 M 76 Given the reaction at STP: N 2 (g) + 3H 2 (g) ----> 2NH 3 (g) What is the total number of liters of NH 3 formed when 20 liters of N 2 reacts completely? (1) 10 L; (2) 20 L; (3) 30 L; (4) 40 L 77 If 100 mole of H2(g) at STP is compared to 100 mole of He(g) at STP, the volumes of the gases would be (1) equal and their masses unequal; (2) equal and their masses equal; (3) unequal and their masses unequal; (4) unequal and their masses equal 78 How many calories of heat are absorbed when 50 grams of water at 100 C are completely vaporized? (Heat of vaporization = 540 cal/g) (1) 590; (2) 5400; (3) 27000; (4) At STP, what mass of CH 4 has the same number of molecules as 64 grams of SO 2? (1) 16 g; (2) 32 g; (3) 64 g; (4) 128 g 80 According to the equation: HCl + NaOH ----> NaCl + H2O The total number of moles of HCl that can be neutralized by 80 grams of NaOH is (1) 10; (2) 20; (3) 36; (4) The density of a gas is 300 grams per liter at STP What is the gram molecular mass of the gas? (1) 747 g; (2) 112 g; (3) 224 g; (4) 672 g 82 A gas has a volume of 1400 milliliters at a temperature of 20 K and a pressure of 760 mm Hg What will be the volume when the temperature is changed to 40 K and the pressure is changed to 380 mm Hg? (1) 350 ml; (2) 750 ml; (3) 1400 ml; (4) 5600 ml 83 Which quantity of helium may be represented by the symbol He? (1) 1 gram; (2) 2 moles; (3) 6 x atoms; (4) 4 liters Stoichiometry page 5 of 8

6 84 When the equation _Na(s) + _H 2 O(l)----> _NaOH(aq) + _H 2 (g) is correctly balanced using smallest whole numbers, the coefficient of the water is (1) 1; (2) 2; (3) 3; (4) 4 85 Given the reaction: 2C 2 (g) + 7O 2 (g)----> 4CO 2 (g) + 6H 2 O(g) At STP, what is the total volume of CO 2 (g) formed when 60 liters (L) of C 2 (g) are completely oxidized? (1) 24 L; (2) 12 L; (3) 60 L; (4) 40 L 86 The percent by mass of carbon in CO 2 is equal to (1) 44/12 x 100; (2) 12/44 x 100; (3) 28/12 x 100; (4) 12/28 x How many grams of KOH are needed to prepare 250 milliliters of a 200 M solution of KOH (formula mass = 560)? (1) 100; (2) 200; (3) 280; (4) What is the gram formula mass of (NH 4 ) 2 SO 4? (1) 160 g; (2) 178 g; (3) 186 g; (4) 132 g 89 What is the maximum number of grams of NH 4 Cl that will dissolve in 200 grams of water at 70 C? (1) 60; (2) 70; (3) 100; (4) Which of the following gases has the greatest density at STP? (1) SO 2 ; (2) CO 2 ; (3) Cl 2 ; (4) N 2 91 At STP, which of the following gases diffuses most rapidly? (1) H 2 ; (2) F 2 ; (3) Ne; (4) Xe 92 The total number of molecules in 340 grams of NH 3 is equal to (1) 100 x 224; (2) 200 x 224; (3) 100 x 602 x ; (4) 200 x 602 x What is the empirical formula of a compound whose composition by mass is 50% sulfur and 50% oxygen? (1) SO; (2) SO 2 ; (3) SO 3 ; (4) S 2 O 3 94 What is the total number of kilocalories of heat needed to change 150 grams of ice to water at 0 degrees C? (Heat of fusion = 80 cal/g) (1) 12; (2) 20; (3) 70; (4) When the equation C2H 4 + O > CO 2 + H 2 O is balanced using smallest whole numbers, what is the coefficient of the O 2? (1) 1; (2) 2; (3) 3; (4) 4 96 Which quantity is equivalent to 39 grams of LiF? (1) 10 mole; (2) 20 moles; (3) 050 mole; (4) 15 moles 97 If 050 liter of a 12-molar solution is diluted to 10 liter the molarity of the new solution is (1) 24; (2) 60; (3) 12; (4) Given the reaction: 4NH 3 (g) + 5O 2 (g) ---> 4NO(g) + 6H 2 O(g) At constant pressure, how many liters of O 2 (g) would be required to produce 40 liters of NO(g)? (1) 50; (2) 90; (3) 32; (4) A 200-gram sample of helium gas at STP will occupy (1) 112 l; (2) 224 l; (3) 336 l; (4) 448 l 100 What is the molecular formula of a compound whose empirical formula is CH 4 and Stoichiometry page 6 of 8

7 molecular mass is 16? (1) CH 4 ; (2) C 2 H 4 ; (3) C 4 H 8 ; (4) C 8 H How many moles of hydrogen atoms are there in one mole of C 6 H 12 O 6 molecules? (1) 1; (2) 6; (3) 24; (4) The density of a gas is 20 grams per liter at STP Its molecular mass is approximately (1) 67; (2) 45; (3) 22; (4) A 5 gram sample of water is heated and the temperature rises from 10 C to 15 C The total amount of heat energy absorbed by the water is (1) 25 cal; (2) 20 cal; (3) 15 cal; (4) 5 cal 104 What is the ratio by mass of carbon to hydrogen in the compound ethane C 2? (1) 6-2; (2) 2-6; (3) 1-4; (4) When the equation NH3 + O2----> HNO3 + H2O is completely balanced using smallest whole numbers, the coefficient of O 2 would be (1) 1; (2) 2; (3) 3; (4) The gram molecular mass of carbon dioxide is the same as the gram molecular mass of (1) CO; (2) SO 2 ; (3) C 2 ; (4) C 3 H The molecular mass of a compound is 70 and its empirical formula is CH 2 What is the molecular formula of the compound? (1) C 2 H 2 ; (2) C 2 H 4 ; (3) C 4 H 10 ; (4) C 5 H Given the reaction: 2Na + 2H 2 O----> 2NaOH + H 2 What is the total number of moles of hydrogen produced when 4 moles of sodium react completely? (1) 1; (2) 2; (3) 3; (4) What is the percent by mass of nitrogen in the following compound: Mg(CN) 2? (1) 14/76 x 100; (2) 14/50 x 100; (3) 28/76 x 100; (4) 28/50 x At constant pressure, 50 milliliters (ml) of a gas at 20 C is heated to 30 C The new volume of the gas in milliliters (ml) is equal to (1) 50 x 20/30; (2) 50 x 30/20; (3) 50 x 293/303; (4) 50 x 303/ The heat of vaporization for water is 540 calories per gram What is the minimum number of calories needed to change 400 grams of water at 100 C to steam at the same temperature and pressure? (1) 43,200; (2) 32,600; (3) 540; (4) A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass What is the empirical formula of this compound? (1) CaCO 3 ; (2) CaC 2 O 4 ; (3) CaC 3 O 6 ; (4) CaCO If the density of a gas at STP is 250 grams per liter what is the gram molecular mass of the gas? (1) 250; (2) 224; (3) 560; (4) Which solution will freeze at the lowest temperature? (1) 1 mole of sugar in 500 g of water; (2) 1 mole of sugar in 1000 g of water; (3) 2 moles of sugar in 500 g of water; (4) 2 moles of sugar in 1000 g of water 115 What is the total number of carbon atoms contained in 224 liters of CO gas at STP? (1) 100; (2) 0500; (3) 301 x ; (4) 602 x The volume of an acid required to neutralize exactly 1500 milliliters (ml) of a base Stoichiometry page 7 of 8

8 could be measured most precisely if it were added to the base solution from a (1) 100 ml graduate; (2) 125 ml Erlenmeyer flask; (3) 50 ml buret; (4) 50 ml beaker Stoichiometry page 8 of 8

9 Name: Stoichiometry Test 31 Multiple Choice 1 The molecular weight (also known as the formula weight) is (1) the sum of the atomic numbers of all of the atoms in a molecule or formula unit; (2) the sum of the atomic weights of all of the atoms in a molecule or formula unit; (3) both 1 and 2 since atomic numbers and atomic weights are the same; (4) none of the above 2 One of the properties associated with hydrates is: (1) water is loosely attached; (2) water is tightly attached; (3) ammonia is attached to a molecule of salt; (4) none of the above; (5) all of the above 3 Balancing a formula equation is achieved by (1) setting the coefficients equal to one and adjusting subscripts in the formulas; (2) adjusting the coefficients to the smallest possible whole number ratio; (3) adjusting the number of elements produced; (4) adjusting the formula of a compound 4 Which of the following enthalpy values would indicate an endothermic reaction? (1) 625 kcal; (2) 625 kcal; (3) 62 kcal; (4) 62 kcal; (5) both (1) and (3); (1,2) both (2) and (4) 5 The formula weight of copper (I) sulfate is (1) 160; (2) 80; (3) 144; (4) The molecular weight of resveratrol, C 14 H 14 O 3, a compound found in wine and may provide cardio-vascular health, is (1) 96; (2) 342; (3) 115; (4) 230; (5) none of the above 7 How many grams would be in 02 mols of iron (II) oxide? (1) 72; (2) 72; (3) 144; (4) 160; (5) 32; (1,2) 32; (1,3) none of the above is within 10% of the answer if the atomic weights are rounded to the nearest integer 8 What is the percentage of iron in iron (II) oxide? (1) 56; (2) 112; (3) 70; (4) 78; (5) none of the above is within 10% of the answer if the atomic weights are rounded to the nearest integer 9 When the equation: Cu 2 O + CH > H 2 O + Cu + CO 2 is correctly balanced the coefficient in front of the formula for copper (I) oxide is (1) 1; (2) 2; (3) 3; (4) 4; (5) none of the above 10 How many mols of methane are required to produce one mol of copper by the reaction given in question 9? (1) 05 mols; (2) 10 mols; (3) 15 mols; (4) 025 mols; (5) 0125; (1,2) none of the above 11 According to the Star Trek manual the element Rodinium (Ro), atomic number 125, Stoichiometry Test page 1 of 3

10 was first discovered on Vega IX According to the quantum theory this element should form Rodinium (V) oxide, Ro 2 O 5 If this compound is found to be 890 % Ro, what would its atomic weight be? (1) 324; (2) 2373; (3) 570; (4) 712; (5) 1424; (1,2) Saccharin, an artificial sweetener which is 3000 times sweeter than sucrose, is composed of 4590% carbon, 273% hydrogen, 2623% oxygen, 765% nitrogen, and 1749% sulfur Its molecular weight is 183 What is the molecular formula of saccharin? (1) C 14 H 10 O 6 N 2 S 2 ; (2) C 5 H 7 O 3 NS; (3) C 8 H 9 O 2 NS; (4) C 7 H 5 O 3 NS 13 After a successful ride on a bronco Sally Samarium said I Rh Later that day she discovered Pyrargyite, an ore of silver, on her land Pyrargyite has the formula Ag 6 Sb 2 S 6 What is the percentage of silver in this ore? (1) 178; (2) 225; (3) 429; (4) 143; (5) For each ton (2000 lbs=908 kg) of land that Sally mines in question 13, 5 % of it is Pyrargyite on the average How much silver can be extracted from one ton of Sally s land? (1) 8,080 G; (2) 10,220 G; (3) 19,480 G; (4) 6,500 G; (5) 27,100 G 15 How much money would Sally make per ton of land, if the price of silver is \$300 per gram? (1) \$81,400; (2) \$20,000; (3) \$58,000; (4) \$31,000; (5) \$24,000 Questions pertain the following problem All numerical answers in this group of problems must be reported to the proper number of significant digits A sample containing gold (III) cyanide and an inert material was to be analyzed for gold by reacting the gold (III) cyanide in the sample with sodium bromide and massing the amount of gold (III) bromide produced The following data was collected mass of the empty 150 ml beaker g mass of the 150 ml beaker plus the sample g mass of the empty filter paper g mass of the filter paper plus gold (III) bromide g 16 Which of the following describes the unbalanced reaction? (1) Au(CN) 3 + NaBr AuBr 3 + NaCN (2) AuCN + NaBr AuBr + NaCN (3) Au(CN) 2 + NaBr AuBr 2 + NaCN (4) Au(SCN) 3 + NaCN AuBr + NaSCN (5) AuSCN + NaCN AuBr + NaSCN (1,2) AuBr 3 + NaCN Au(CN) 3 + NaBr (1,3) AuBr + NaCN AuCN + NaBr (1,4) none of the above 17 The mass of gold (III) bromide produce in this analysis is (1) 8939 g; (2) 7939 g; (3) 1000 g; (4) g; (5) 9000 g; (1,2) 894 g; (1,3) 794 g; (1,4) 10 g; (15) none of the above 18 The mols of gold (III) bromide collected in this analysis is (1) ; (2) ; Stoichiometry Test page 2 of 3

11 (3) ; (4) ; (5) ; (1,2) ; (1,3) The mass (in grams) of gold (III) cyanide that had to be present in the sample is (1) 5 g; (2) 50 g; (3) 500; (4) 5000; (5) 50000; (1,2) 10000; (1,3) none of the above 20 The percentage of gold (III) cyanide that was present in the sample was (1) 50; (2) 500; (3) 5000; (4) 50000; (5) 50001; (1,2) 5001; (1,3) 501 Short Answer 1 Zeanxanthin is one of the compounds found to cause the colors in maple leaves in the fall It has a molecular weight of 544 and is 8382% carbon, 1029% hydrogen, and 588% oxygen Find the molecular formula of zeanxanthin 3 Copper can be extracted from copper (II) oxide by reduction with methane The unbalanced reaction is: CuO + CH > Cu + CO 2 + H 2 O Calculate the amount of copper than can be produced from 1000 g of Copper (II) oxide [Note: two points extra credit will be given for an answer calculated and reported to the proper number of significant digits] Extra Credit 1 What did Sally say in question 13? 2 What is BaNa 2 S? Stoichiometry Test page 3 of 3

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