8. What are the empirical formulas of the compounds with the following compositions?(a) 2.1 percent H, 65.3 percent 0, 32.6 percent S;(b) 20.2 percent Al, 79.8 percent Cl.9. a) The empirical formula of a compound is CH. If the molar mass of this compound is about 78g.What is its molecular formula?b) The molar mass of caffeine is 194.19 g. Determine the molecular formula of caffein CH5N;O orC8H10N4O2.

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0. What are the empirical formulas of the compounds with the following compositions? (a) 2.1 percent H, 65.3 percent 0, 32.6 percent S; (b) 20.2 percent Al, 79.8 percent Cl.

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

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

8. What are the empirical formulas of the compounds with the following compositions?
(a) 2.1 percent H, 65.3 percent 0, 32.6 percent S;
(b) 20.2 percent Al, 79.8 percent Cl.
9. a) The empirical formula of a compound is CH. If the molar mass of this compound is about 78g.
What is its molecular formula?
b) The molar mass of caffeine is 194.19 g. Determine the molecular formula of caffein CH5N;O or
C8H10N4O2.

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