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Exam 2: Chemical Formulas, Chemical Equations, and Reaction Yields

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Question 1

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For the given unbalanced reaction X CaO(s) + y H₂O(l) $\rightarrow$ z Ca(OH) ₂ The correct stiochiometric coefficients x, y, & z are

A) 1,1,1
B) 1,2,1
C) 2,1,2
D) 2,1,1
E) 1,1,2

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Question 2

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Which has a larger molar volume (the volume occupied by one mole) : Gold (density = 19.3 g cm^-3) or tin (density = 7.31 g cm^-3) ?

A) gold
B) tin
C) they are exactly the same
D) there is no way to know without other information

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Question 3

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A vanadium oxide contains 56.02% vanadium by mass. What is its empirical formula?

Ammonium perchlorate, NH₄ClO₄, is used with aluminum as rocket fuel. 10 Al(s) + 6 NH₄ClO₄ $\rightarrow$ 4 Al₂O₃ + 2 AlCl₃ + 12 H₂O + 3 N₂ If 100.0 g of aluminum are reacted with 60.0 g of ammonium perchlorate, how many grams of aluminum oxide are produced?

Sodium perbromate can be synthesized via the following reaction that gives off Xenon gas. A reaction is started with 200.0g of NaBrO₃, 250.0g of XeF₂ and 100.0g of water. Assuming that the reaction goes to completion, and that all of the formed xenon gas is allowed to escape into the atmosphere, what will be the minimum mass of products and reactants remaining in the reaction vessel?

What is the relative molecular mass of the compound trinitrotoluene, C₇H₅N₃O₆ (on the ¹²C scale) ?

Copper oxide ore, CuO, can be smelted with carbon to make copper metal and carbon dioxide. 2CuO(s) + C(s) $\rightarrow$ 2Cu(s) + CO₂(g) If 100.0 of a mixed ore is smelted and produces 75.9 grams of pure copper. What percentage of the mixed ore is CuO? (You can assume the reaction yield is 100%, there is excess carbon, and that CuO is the only source of copper.)

Acetonitrile, CH₃CN, can be synthesized from carbon monoxide, hydrogen, and ammonia in the presence of a catalyst at high temperatures by the following reaction 2CO(g) + 2H₂(g) +NH₃(g) $\rightarrow$ CH₃CN(g) + 2H₂O(g) If 20 g of carbon monoxide, 20 g of hydrogen, and 10 g of ammonia are reacted, which will be the limiting reagent?

Caffeine has the molecular formula, C₈H₁₀N₄O₂. If it is burned in excess oxygen it will form carbon dioxide, water vapor, and nitrogen gas. Which gas will be most abundant by mass?

Aluminum sulfide reacts with water to form aluminum hydroxide and hydrogen sulfide by the following reaction Al₂S₃ + 6 H₂O $\rightarrow$ 2Al(OH) ₃ + 3H₂S If 25 g of aluminum sulfide is reacted with 25 g of water how many moles of hydrogen sulfide will be formed?

Calcium carbide, CaC₂, reacts with water to produce calcium hydroxide and acetylene gas, C₂H₂. CaC₂(s) + 2 H₂O(l) $\rightarrow$ Ca(OH) ₂(aq) + C₂H₂(g) How many grams of acetylene can be produced from 30.0 g of calcium carbide?

Iron oxide can be reduced to iron by a reaction with carbon to form carbon monoxide Fe₂O₃(s) + 3C(s) $\rightarrow$ 2Fe(s) + 3CO(g) If 95.0 grams of iron oxide is reacted with excess carbon yields 63 g of iron, what is the percent yield of this reaction?

In fermentation, sucrose, C₁₂H₂₂O₁₁, reacts with water to form ethanol, C₂H₅OH, and carbon dioxide. A balanced chemical equation for this reaction is?

Vitamin B₁₂, cyanocobalamin, has the molecular formula, C₆₈H₈₈CoN₁₄O₁₄P. What is the percent mass of cobalt in this compound?

Triphenylene is an organic compound containing only carbon and hydrogen with 3 carbon atoms for every two hydrogen atoms. Which of the following is a possible molecular mass for triphenylene?