what is the percent by mass

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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Answer number 12
eet Ch 4 Answers.pdf (228 KB)
10. Analysis of a metal chloride XCI3 shows that it contains 67.2 percent CI by mass.
Calculate the molar mass of X, and identify the element.
Ans : Cr, MM 52.0 g/mol
11. A mixture of NaBr and Na2SO4 contains 29.96 percent Na by mass. Calculate the
percent by mass of each compound in the mixture.
Ans : 24.10% NaBr and 75.90% NazSO4 appoximately
12. A mixture of CuSO4 5H20 and M9SO4 7H2O is heated until all the water is lost. If
5.020 g of the mixture gives 2.988 g of the anhydrous salts, what is the percent by mass
of CUSO4 5H2O in the mixture?
Ans : 70.70 % approximately
empirical formula and molecular formula
13a. An organic compound consists of 40.00% c, 6.667% H and 53.33% O by mass. The
molar mass of the compound is 180. g/mol. What is its molecular formula?
Ans : C6 H12O6
Transcribed Image Text:eet Ch 4 Answers.pdf (228 KB) 10. Analysis of a metal chloride XCI3 shows that it contains 67.2 percent CI by mass. Calculate the molar mass of X, and identify the element. Ans : Cr, MM 52.0 g/mol 11. A mixture of NaBr and Na2SO4 contains 29.96 percent Na by mass. Calculate the percent by mass of each compound in the mixture. Ans : 24.10% NaBr and 75.90% NazSO4 appoximately 12. A mixture of CuSO4 5H20 and M9SO4 7H2O is heated until all the water is lost. If 5.020 g of the mixture gives 2.988 g of the anhydrous salts, what is the percent by mass of CUSO4 5H2O in the mixture? Ans : 70.70 % approximately empirical formula and molecular formula 13a. An organic compound consists of 40.00% c, 6.667% H and 53.33% O by mass. The molar mass of the compound is 180. g/mol. What is its molecular formula? Ans : C6 H12O6
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