Problem Solving:1. An analysis of a compound having a molar mass of 180g/mol gives the following percentage composition: 40% C,6.67% H, and 53.33% O. Find the empirical and themolecular formulas of the compound.2. Determine the empirical formula of a compound havingthe following percentage composition: 26.53% K, 35.3% Cr,and 38.10% O. If the compound has a molar mass of 294g/mol, what is its molecular formula?

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1. An analysis of a compound having a molar mass of 180 g/mol gives the following percentage composition: 40% C, 6.67% H, and 53.33% O. Find the empirical and the molecular formulas of the compound.

Chemistry & Chemical Reactivity

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Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter2: Atoms Molecules And Ions

Section2.8: Instrumental Analysis: Determining Compound Formulas

Problem 2.2ACP: Salvarsan was long thought to be a single substance. Recently, however, a mass spectrometry study of...

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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.

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Problem Solving:
1. An analysis of a compound having a molar mass of 180
g/mol gives the following percentage composition: 40% C,
6.67% H, and 53.33% O. Find the empirical and the
molecular formulas of the compound.
2. Determine the empirical formula of a compound having
the following percentage composition: 26.53% K, 35.3% Cr,
and 38.10% O. If the compound has a molar mass of 294
g/mol, what is its molecular formula?

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