Interpretation: The empirical formula of a compound that contains 62.1% C, 13.8% H, and 24.1% N should be calculated.
Concept Introduction: The percent composition represents the relative amount of the elements in a compound. It is represented as the percent by mass of each element in the compound.
Answer to Problem 40SP
The empirical formula of a compound that contains 62.1% C, 13.8% H, and 24.1% N is
Explanation of Solution
The percent by mass of each element in the compound represents the percent composition as:
So, 100.0 g of the compound contains 62.1 g C, 13.8 g H, and 24.1 g N.
By using the molar mass of an element, the ratio of masses can be changed to the ratio of moles by using the following conversion factor:
The molar mass of
The percent by mass of
The mole ratio of the compound is
Now, each molar quantity is divided by the smaller number of moles:
Hence, the empirical formula of a compound that contains 62.1% C, 13.8% H, and 24.1% N is
Chapter 10 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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