Answer number 12 ### Chemistry Problem Set**10.** Analysis of a metal chloride XCl$_3$ shows that it contains 67.2 percent Cl by mass. Calculate the molar mass of X, and identify the element.**Answer:** Cr, Molar Mass 52.0 g/mol---**11.** A mixture of NaBr and Na$_2$SO$_4$ contains 29.96 percent Na by mass. Calculate the percent by mass of each compound in the mixture.**Answer:** 24.10% NaBr and 75.90% Na$_2$SO$_4$ approximately---**12.** A mixture of CuSO$_4$·5H$_2$O and MgSO$_4$·7H$_2$O 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 CuSO$_4$·5H$_2$O in the mixture?**Answer:** 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?**Answer:** C$_6$H$_12$O$_6$--- This problem set is designed to enhance your understanding of chemical compositions and calculations related to molar masses, percentages, and molecular formulas.

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Answered: what is the percent by mass

what is the percent by mass

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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