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In order to calculate the percentage composition by mass of a compound, it is necessary to know: (A.) The relative numbers of each kind of atom making up the compound. B The empirical formula of the compound. The molecular formula of the compound. The number of particles of each element.

In order to calculate the percentage composition by mass of a compound, it is necessary to know: (A.) The relative numbers of each kind of atom making up the compound. B The empirical formula of the compound. The molecular formula of the compound. The number of particles of each element.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Part I Multiple Choice. Read each question carefully, and then darken the circle that corresponds to the correct answer. 1. In order to calculate the percentage composition by mass of a compound, it is necessary to know: A The relative numbers of each kind of atom making up the compound. B The empirical formula of the compound. C. The molecular formula of the compound. D, The number of particles of each element. 2. Find the percentage composition of Mg in Mg3(PO4)2. A.) 27.48% B. 43.11 % C 16.00 % 12.63% 3. The molar mass of an element is equal to its. A.) Atomic mass Molecular mass B. Atomic number D. Valence electrons 4. Cane sugar (C12H22011) is a white, odorless, crystalline powder with a sweet taste. What is the percent composition of Hydrogen in cane sugar? (A. 4.211% B.) 6.491 % (C.) 51.45% (D) 72.37% 5. If two samples labeled "NaCl" are analyzed and found to contain different percentages of chlorine, which of the following is probably true? A.) At least one of the samples must not be pure. B) The two samples must have been from different origins. C) There must be at least two different compounds with the formula NaCI. D) The ratio of the two different chlorine percentages must result in a small integer value.
Transcribed Image Text:Part I Multiple Choice. Read each question carefully, and then darken the circle that corresponds to the correct answer. 1. In order to calculate the percentage composition by mass of a compound, it is necessary to know: A The relative numbers of each kind of atom making up the compound. B The empirical formula of the compound. C. The molecular formula of the compound. D, The number of particles of each element. 2. Find the percentage composition of Mg in Mg3(PO4)2. A.) 27.48% B. 43.11 % C 16.00 % 12.63% 3. The molar mass of an element is equal to its. A.) Atomic mass Molecular mass B. Atomic number D. Valence electrons 4. Cane sugar (C12H22011) is a white, odorless, crystalline powder with a sweet taste. What is the percent composition of Hydrogen in cane sugar? (A. 4.211% B.) 6.491 % (C.) 51.45% (D) 72.37% 5. If two samples labeled "NaCl" are analyzed and found to contain different percentages of chlorine, which of the following is probably true? A.) At least one of the samples must not be pure. B) The two samples must have been from different origins. C) There must be at least two different compounds with the formula NaCI. D) The ratio of the two different chlorine percentages must result in a small integer value.
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