Slide 1 / 90 Slide 2 / 90 Stoichiometry HW 1 The calculation of quantities in chemical equations is called _____. Grade: «grade» Subject: Date: «date» A accuracy and precision B dimensional analysis C percent composition D percent yield E stoichiometry Slide 3 / 90 Slide 4 / 90 2 What is conserved in the reaction shown below? 3 What is conserved in the reaction shown below? H 2 (g) + Cl 2 (g) → 2HCl(g) N 2 (g) + 3F 2 (g) → 2NF 3 (g) A only mass A only atoms B only mass and moles B only mass C only mass, moles, and molecules C only mass and atoms D only mass, moles, molecules and volume D only moles E atoms and mass E only mass, atoms, moles, and molecules Slide 5 / 90 Slide 6 / 90 4 In every chemical reaction, 5 Which of the following statements is true about the total number of reactants and the total number of products in this reaction? C 5 H 12 (l) + 8O 2 (g) → 5CO 2 (g) + 6H 2 O(g) A mass and molecules are conserved B moles and liters are conserved 9 moles of reactants regroup to form 11 moles C mass and atoms are conserved A of product D moles and molecules are conserved 9 grams of reactants regroup to form 11 grams B E mass and liters are conserved of product 9 liters of reactants regroup to form 11 liters of C product 9 atoms of reactants regroup to form 11 atoms D of product 22.4 liters of reactants regroup to form 22.4 E liters of product
Slide 7 / 90 Slide 8 / 90 6 Which of these is an INCORRECT interpretation of 7 In a chemical reaction the mass of the products this balanced equation? 2S(s) + 3O 2 (g) → 2SO 3 (g) A is less than the mass of the reactants B is greater than the mass of the reactants A 2 atoms S + 3 molecules O 2 → 2 molecules SO 3 C is equal to the mass of the reactants B 2 g S + 3 g O 2 → 2 g SO 3 D has no relationship to the mass of the reactants C 2 mol S + 3 mol O 2 → 2 mol SO 3 E depends on the reaction equation D 2 L S + 3L O 2 → 2L SO 3 E none of the above Slide 9 / 90 Slide 10 / 90 9 Which of the following statements is true about the 8 In any chemical reaction the quantities that are following reaction? preserved are 3NaHCO 3 (aq) + C 6 H 8 O 7 (aq) → 3CO 2 (g) + 3H 2 O(s) +Na 3 C 6 H 5 O 7 (aq) A the number of moles and the volumes B the number of molecules and the volumes A 22.4 L of CO 2 (g) are produced for every liter of C 6 H 8 O 7 (aq) reacted C mass and number of atoms 1 mole of water is produced for every mole of carbon dioxide B produced D mass and moles 6.02 x 10 23 molecules of Na 3 C 6 H 5 O 7 (aq) are produced C E mass only for every mole of NaHCO 3 (aq) used D 54 g of water is produced for every mole of NaHCO 3 (aq) produced Slide 11 / 90 Slide 12 / 90 10 In the reaction 2CO(g) + O 2 (g) → 2CO 2 (g), what is 11 The combustion of propane (C 3 H 8 ) produces CO 2 the ratio of moles of oxygen used to moles of CO 2 and H 2 O: produced? C 3 H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2 O (l) The reaction of 2.5 mol of O 2 will produce __________ mol of H 2 O. A 1:1 B 2:1 A 4.0 C 1:2 B 3.0 D 2:2 C 2.5 D 2.0 E 1.0
Slide 13 / 90 Slide 14 / 90 12 The combustion of propane (C 3 H 8 ) in the presence 13 Lithium and nitrogen react to produce lithium of excess oxygen yields CO 2 and H 2 O: nitride: C 3 H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2 O 6Li (s) + N 2 (g) → 2Li 3 N (s) When 2.5 mol of O 2 are consumed in their How many moles of N 2 are needed to react with reaction, __________ mol of CO 2 are produced. 0.500 mol of lithium? A 1.5 A 3.00 B 3.0 B 0.500 C 5.0 C 0.167 D 6.0 D 1.50 E 2.5 E 0.0833 Slide 15 / 90 Slide 16 / 90 14 Lithium and nitrogen react to produce lithium nitride: 15 Lithium and nitrogen react in a combination reaction 6Li (s) + N 2 (g) → 2Li 3 N (s) to produce lithium nitride: How many moles of lithium nitride are produced 6Li (s) + N 2 (g) → 2Li 3 N (s) when 0.30 mol of lithium react in this fashion? How many moles of lithium are needed to produce 0.50 mol of Li 3 N when the reaction is carried out in the presence of excess nitrogen? A 0.100 A 0.30 B 0.500 B 1.50 C 0.0750 C 0.20 D 1.35 D 0.40 E 0.225 E 3.6 Slide 17 / 90 Slide 18 / 90 16 Magnesium burns in air with a dazzling brilliance to 17 Automotive air bags inflate when sodium azide produce magnesium oxide: decomposes explosively to its constituent elements: 2Mg (s) + O 2 (g) → 2MgO (s) 2NaN 3 (s) → 2Na (s) + 3N 2 (g) How many moles of O 2 are consumed when 0.880 How many moles of N 2 are produced by the mol of magnesium burns? decomposition of 5.25 mol of sodium azide? A 0.0317 A 5.25 B 2.60 B 8.64 C 0.880 C 7.88 D 1.54 D 0.960 E 0.44 E 1.44
Slide 19 / 90 Slide 20 / 90 18 How many moles of aluminum are needed to react 19 Calculate the number of moles of Al 2 O 3 that are completely with 3.2 mol of FeO? produced when 15 mol of Fe is produced in the 2Al(s) + 3FeO(s) → 3Fe(s) + Al 2 O 3 (s) following reaction. 2Al(s) + 3FeO(s) → 3Fe(s) + Al 2 O 3 (s) A 3.2 mol A 5 mol B 2.1 mol B 15 mol C 1.6 mol C 45 mol D 6.4 mol D 7.5 mol E 4.8 mol E 30 mol Slide 21 / 90 Slide 22 / 90 20 How many moles of glucose, C 6 H 12 O 6 , can be burned 21 Hydrogen gas can be produced by reacting aluminum when 60.0 mol of oxygen is available? with sulfuric acid. How many moles of sulfuric acid C 6 H 12 O 6 (s) + 6O 2 (g) → 6CO 2 (g) + 6H 2 O(l) are needed to completely react with 25.0 mol of aluminum? 2Al(s) + 3H 2 SO 4 (aq) → Al 2 (SO 4 ) 3 (aq) + 3H 2 (g) A 0.938 mol A 0.100 mol B 10 mol B 10.0 mol C 60 mol C 25.0 mol D 120 mol D 37.5 mol E 301 mol E 75 mol Slide 23 / 90 Slide 24 / 90 22 When iron rusts in air, iron(III) oxide is produced. How 23 How many moles of H 3 PO 4 are produced when many moles of oxygen react with 2.4 mol of iron? 71.0 g P 4 O 10 reacts completely to form H 3 PO 4 ? 4Fe(s) + 3O 2 (g) → 2Fe 2 O 3 (s) P 4 O 10 (s) + 6H 2 O(l) → 4H 3 PO 4 (aq) A 0.0635 mol A 1.2 mol B 1.00 mol B 1.8 mol C 4.00 mol C 2.4 mol D 16.0 mol D 3.2 mol E 98.0 mol E 4.8 mol
Slide 25 / 90 Slide 26 / 90 24 Calcium carbide (CaC 2 ) reacts with water to 25 Magnesium and nitrogen react in a combination produce acetylene (C 2 H 2 ): reaction to produce magnesium nitride: CaC 2 (s) + 2H 2 O (g) → Ca(OH 2 ) (s) + C 2 H 2 (g) 3Mg + N 2 → Mg 3 N 2 Production of 13 g of C 2 H 2 requires consumption In a particular experiment, a 10 g sample of N 2 reacts of __________ g of H 2 O. completely. The mass of Mg consumed is _________ g. A 4.5 A 8.04 B 9.0 B 26.0 C 18 C 16.1 4.8x10 2 D D 0.92 4.8x10 -2 E E 13.9 Slide 27 / 90 Slide 28 / 90 26 The combustion of ammonia in the presence of 27 The combustion of ammonia in the presence of excess oxygen yields NO 2 and H 2 O: excess oxygen yields NO 2 and H 2 O: 4NH 3 (g) + 7O 2 (g) → 4NO 2 (g) + 6H 2 O (g) 4NH 3 (g) + 7O 2 (g) → 4NO 2 (g) + 6H 2 O (g) The combustion of 28.8 g of ammonia consumes The combustion of 43.9 g of ammonia produces __________ g of oxygen. __________ g of NO 2 . A 94.7 A 2.58 B 54.1 B 178 C 108 C 119 D 15.3 D 0.954 E 28.8 E 43.9 Slide 29 / 90 Slide 30 / 90 28 Under appropriate conditions, nitrogen and 29 Lead (II) carbonate decomposes to give lead (II) hydrogen undergo a combination reaction to yield oxide and carbon dioxide: ammonia: PbCO 3 (s) → PbO (s) CO 2 (g) N 2 (g) + 3H 2 (g) → 2NH 3 (g) How many grams of lead (II) oxide will be A 7.1-g sample of N 2 requires __________ g of H 2 produced by the decomposition of 2.50 g of lead for complete reaction. (II) carbonate? A 0.51 A 0.41 B 0.76 B 2.50 C 1.2 C 0.00936 D 1.5 D 2.09 E 17.2 E 2.61
Slide 31 / 90 Slide 32 / 90 30 The combustion of propane (C 3 H 8 ) in the presence 31 Under appropriate conditions, nitrogen and of excess oxygen yields CO 2 and H 2 O: hydrogen undergo a combination reaction to yield C 3 H 8 (g) + 5O 2 (g) → 3CO 2 (g) + 4H 2 O ammonia: When 7.3 g of C 3 H 8 burns in the presence of N 2 (g) + 3H 2 (g) → 2NH 3 (g) excess O 2 , __________ g of CO 2 is produced. A 9.3-g sample of hydrogen requires __________ g of N 2 for a complete reaction. Slide 33 / 90 Slide 34 / 90 32 Water can be formed from the stoichiometric 33 The combustion of carbon disulfide in the reaction of hydrogen with oxygen: presence of excess oxygen yields carbon dioxide 2H 2 (g) + O 2 (g) → 2H 2 O (g) and sulfur dioxide: A complete reaction of 5.0 g of O 2 with excess CS 2 (g) + 3 O 2 (g) → CO 2 (g) + 2SO 2 (g) hydrogen produces __________ g of H 2 O. The combustion of 15 g of CS 2 in the presence of excess oxygen yields __________ g of SO 2 . Slide 35 / 90 Slide 36 / 90 34 Automotive air bags inflate when sodium azide 35 Magnesium burns in air with a dazzling brilliance to decomposes explosively to its constituent produce magnesium oxide: elements: 2Mg (s) + O 2 (g) → 2MgO (s) 2NaN 3 (s) → 2Na (s) + 3N 2 (g) When 4.00 g of magnesium burns, the theoretical How many grams of sodium azide are required to yield of magnesium oxide is __________ g. produce 33.0 g of nitrogen? A 1.77 A 4.00 B 0.785 B 6.63 C 76.6 C 0.165 D 51.1 D 3.32 E 114.9 E 13.3
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