
Concept explainers
Interpretations: Molecular formula of the hydrocarbon must be found for which the % of C is 81.71 and molar mass is 44.09 g/mol.
Concept Introduction:
The empirical formula of a molecule is the smallest unit that is repeated in the molecule.
The molecular formula of a compound is the representation of the molecule with the number of different atoms present in the molecule.
Molecular formula
Where n is any positive integer like 1, 2, 3 and so on.

Answer to Problem 5RQ
The molecular formula is C3H8.
Explanation of Solution
The molecular formula can be found from the empirical formula using the following relationship.
Molecular formula
Where n is any positive integer like 1, 2, 3 and so on.
% of C
Moles of C
Smallest mole ratio C: H
Thus empirical formula is C3H8.
Now molar mass 44.09= (C3H8) n or, n
Thus molecular formula is C3H8.
Molecular formula of the compound is C3H8.
Chapter 6 Solutions
World of Chemistry, 3rd edition
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