a.) The percent composition of an unknown compound is 48.71% C, 30.73% O, 11.96% N, and 8.60% H. What is its empirical formula? Show your work. b.) We have an oxide of cobalt (the substance contains only Co and O) that is, by mass, 58.93% Co. What is its empirical formula?
a.) The percent composition of an unknown compound is 48.71% C, 30.73% O, 11.96% N, and 8.60% H. What is its empirical formula? Show your work. b.) We have an oxide of cobalt (the substance contains only Co and O) that is, by mass, 58.93% Co. What is its empirical formula?
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter2: Chemical Compounds
Section: Chapter Questions
Problem 2.DCP
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Question
a.) The percent composition of an unknown compound is 48.71% C, 30.73% O, 11.96% N, and 8.60% H. What is its empirical formula? Show your work.
b.) We have an oxide of cobalt (the substance contains only Co and O) that is, by mass, 58.93% Co. What is its empirical formula?
Expert Solution
Step 1
According to the mole concept, in terms of mass, the amount of substance in moles is equal to the ratio of its mass to the molar mass.
Step 2
a)
The empirical formula of the unknown compound is calculated as follows:
Element | Mass % | Molar mass | Molar ratio | Simplest molar ratio | Simplest whole number molar ratio |
C | 48.71 | 12 | =4.75 | 19 | |
O | 30.73 | 16 | 9 | ||
N | 11.96 | 14 | 4 | ||
H | 8.60 | 1 | 40 |
Thus, the empirical formula of the unknown sample is C19H40N4O9.
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