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Exam 4: Chemical Reactions

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Question 31

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What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al(s) + HCl(aq) → AlCl₃(aq) + H₂(g)

A) 13
B) 11
C) 18
D) 19
E) 21

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Question 32

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If the percent yield is 82.0%, how many grams of silicon is needed to make 105 g of chromium by the reaction: 3 Si (s) + 2 Cr₂0₃ (s) → 3 SiO₂ (s) + 4 Cr (l) ?

A) 51.9 g
B) 92.2 g
C) 42.5 g
D) 34.9 g
E) 13.0 g

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Question 33

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Cryolite is a compound needed for the Hall-Heroult process for producing aluminum. Cryolite is produced by the following reaction: 6 HF + Al(OH) ₃ + 3 NaOH → Na₃AlF₆ + 6 H₂O How many grams of cryolite are produced if the reaction has a 67.3% yield and a limiting reagent of 35.4 grams of NaOH?

What is the percent yield if 122 grams of SiO₂ are made from 246 g of Cr₂O₃ by the following equation? 3 Si(s) + 2 Cr₂O₃(s) → 3 SiO₂(s) + 4 Cr(l)

What is the sum of the coefficients in the balanced equation that represents the complete combustion of the relatively new gasoline additive "MTBE," for which the molecular formula is C5H12O?

One source of iodine is sodium iodate. Iodine is produced by a series of reactions. The first reaction is a reduction reaction with sodium hydrogen sulfite. IO₃^-( aq) + 3 HSO₃^- (aq) → I^- (aq) + 3 SO₄^2- (aq) + 3 H⁺(aq) 5 I^- (aq) + IO₃^- (aq) + 6 H⁺ (aq) → 3 I₂(s) + 3 H₂O How many grams of iodine are produced from 1.00 × 10² grams of NaHSO₃ if each reaction has a 95.0% yield?

What is the percent yield if 185 grams of SiO₂ are made from 328 g of Cr₂O₃ by the following equation? 3 Si(s) + 2 Cr₂O₃(s) → 3 SiO₂(s) + 4 Cr(l)

You have 10.00 L of a 0.350 M KCl solution, but you need a solution that is 0.450 M. What volume of water, in L, would you evaporate from the solution?

"Washing soda" (sodium carbonate) may be used to "soften" water by the removal of certain ions that would otherwise react with common soaps. When the "hardness" is due to calcium ion, the "softening" process may be represented as: Ca²⁺(aq) + CO₃^2-(aq) → CaCO₃(s) What mass of sodium carbonate would be required to remove essentially all of the calcium ion from 750 L of solution containing 43 mg Ca²⁺ per liter?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? C₂H₆ + O₂ → CO₂ + H₂O

Given the following reactions: Fe + Br₂ → FeBr₂ 3 FeBr₂ + Br₂ → Fe₃Br₈ If each reaction is 82.0% efficient, what mass of iron is necessary to make 8.45 g of Fe₃Br₈?

What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH₂O) per mL?

Nitroglycerin, used both in medicine and as an explosive, can be prepared by the carefully controlled reaction of glycerol (C₃H₈O₃) with nitric acid, as symbolized by: C₃H₈O₃ + 3 HNO₃ → C₃H₅N₃O₉ + 3 H₂O What mass of nitric acid is required for the production of 2.8 g of nitroglycerin by a process having a 67% yield?

How many grams of sulfuric acid, H₂SO₄, can be obtained from 578 grams of iron ore if the ore is 76.0% by mass FeS? The reactions involved are given below. Each reaction is 92.0% efficient. 4 FeS + 7O₂ → 2 Fe₂O₃ + 4 SO₂ 2 SO₂ + O₂ → 2 SO₃ SO₃ + H₂O → H₂SO₄

42.6 g Cu are combined with 84.0 g of HNO₃ according to the reaction: 3 Cu + 8 HNO₃ → 3 Cu(NO₃) ₂ + 2 NO + 4 H₂O. Which reagent is limiting and how many grams of Cu(NO₃) ₂ are produced?

24.0 g of ethane (C₂H₆) are burned to form CO₂ and H₂O. How many grams of CO₂ are produced?

Acetylene gas may be produced by carefully adding water to calcium carbide, according to the equation: CaC₂(s) + 2 H₂O(l) → Ca(OH) ₂(s) + C₂H₂(g) When a 37 g sample of an impure calcium carbide was treated with excess water, 13 g of acetylene gas was produced. If the reaction is essentially 100% efficient, what was the percentage of nonreacting impurity in the carbide sample?

What is the molarity of 10.9 g KCl dissolved in 150.0 mL of water?

What mass of oxygen gas would be consumed by the complete combustion of 7.5 g of a mixture of propane (C₃H₈) and butane (C₄H₁₀) in the mole ratio of C₃H₈/C₄H₁₀ = 1.33?

What mass of trisodium phosphate is required to prepare 250.0 mL of a solution that is 0.30 M in sodium ion?