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Exam 3: Stoichiometry

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Question 21

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Sodium perbromate can be synthesized via the following reaction that gives off Xenon gas. NaBrO₃ + XeF₂ + H₂O NaBrO₄ + 2HF + Xe A reaction is started with 200.0g of NaBrO₃, 200.0g 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?

A) 326.4 g
B) 174.0 g
C) 344.9 g
D) 154.8 g
E) Not enough information given to answer the question

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Question 22

Multiple Choice

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Roundup, an herbicide manufactured by Monsanto, has the formula C₃H₈NO₅P. How many moles of molecules are there in a 500.-g sample of Roundup?

A) 84.5
B) 2.96
C) 0.338
D) 1.75
E) none of these

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Question 23

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NaHCO₃ is the active ingredient in baking soda. How many grams of oxygen are in 0.31 g of NaHCO₃?

You find a compound composed only of element X and hydrogen, and you know that it is 91.33% element X by mass. Each molecule has 2.67 times as many H atoms as X atoms. What is element X?

What is the percent by mass of hydrogen in ammonium acetate?

Caffeine consists of carbon, hydrogen, oxygen, and nitrogen. When 0.1920 g of caffeine is burned in an excess of oxygen, 0.3482 g of carbon dioxide and 0.0891 g water are formed. Caffeine is 28.84% nitrogen by mass. Its molar mass is between 190 and 200 g/mol. What is the formula for caffeine?

Indium reacts with chlorine to form InCl₃. In the balanced equation for this reaction, the coefficient of the indium trichloride is

Boron naturally occurs in two isotopic forms. The more common isotope is ¹¹B (atomic mass 11.01 amu) , which is 80.00% abundant. The average atomic mass of boron is 10.81. What is the mass of the other isotope?

A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO₂ and 0.1767 g of H₂O. What is the empirical formula of the compound?

Phosphorus has the molecular formula P₄ and sulfur has the molecular formula S₈. How many grams of phosphorus contain the same number of molecules as 6.41 g of sulfur?

A mixture of NaCl and NaNO₃ is 31.7% sodium by mass. What is the approximate percent of NaCl in this mixture?

SO₂ reacts with H₂S as follows: 2H₂S + SO₂  3S + 2H₂O When 7.50 g of H₂S reacts with 12.75 g of SO₂, which statement applies?

What mass of styrene (molar mass 104.1 g/mol) contains 4.50  10²⁰ molecules of styrene?

Acetylsalicylic acid, or aspirin (C₉H₈O₄), is an analgesic (pain reliever). A typical aspirin tablet contains 500.0 mg of acetylsalicylic acid. -Determine the number of molecules of acetylsalicylic acid in the tablet.

The mass percent of iron in an iron oxide is 77.7%. Find the empirical formula.

The refining of aluminum from bauxite ore (which contains 50.% Al₂O₃ by mass) proceeds by the overall reaction 2Al₂O₃ + 3C  4Al + 3CO₂. How much bauxite ore is required to give the 5.0  10¹³ g of aluminum produced each year in the United States? (Assume 100% conversion.)

Acetylsalicylic acid, or aspirin (C₉H₈O₄), is an analgesic (pain reliever). A typical aspirin tablet contains 500.0 mg of acetylsalicylic acid. -Determine the molar mass of acetylsalicylic acid.

The limiting reactant in a reaction

How many molecules of ammonia are present in 7.5 g of ammonia?

Which compound has the smallest molar mass?