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128 Chapter Three Stoichiometry •. Marathon Problems These problems are designed to incorporate several concepts and techniques into one situation. *171. From the information below, determine the mass of substance C that will be formed if 45.0 grams of substance A reacts with 23.0 grams of substance B. (Assume that the reaction between A and B goes to completion.) a. Substance A is a gray solid that consists of an alkaline earth metal and carbon (37.5% by mass). It reacts with substance B to produce substances C and D. Forty million trillion for- mula units of A have a mass of 4.26 milligrams. b. 47.9 grams of substance B contains 5.36 grams of hydrogen and 42.5 grams of oxygen. c. When 10.0 grams of C is burned in excess oxygen, 33.8 grams of carbon dioxide and 6.92 grams of water are produced. A *u sed with permission from the Journal of Chemical Education, Vol. 68, No. 11, 1991, pp. 919-922; copyright © 1991, Division of Chemical Education, Inc. mass spectrum of substance C shows a parent molecular ion
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Unformatted text preview: with a mass-to-charge ratio of 26. d. Substance D is the hydroxide of the metal in substance A. 172. Consider the following balanced chemical equation: A + 5B -----+ 3C + 4D a. Equal masses of A and B are reacted. Complete each of the following with either "A is the limiting reactant because ____ "; "B is the limiting reactant because "; or "we cannot determine the limiting reactant because 1. If the molar mass of A is greater than the molar mass of B, then 11. If the molar mass of B is greater than the molar mass of A, then b. The products of the reaction are carbon dioxide (C) and wa-ter (D). Compound A has the same molar mass as carbon dioxide. Compound B is a diatomic molecule. Identify com-pound B and support your answer. c. Compound A is a hydrocarbon that is 81.71 % carbon by mass. Determine its empirical and molecular formulas....
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