Concept explainers
Interpretation:
Empirical formula and molecular formula of naphthalene must be found for which % of C and H are is 93.7 and 6.3 respectively. Molar mass of naphthalene is 128 g/mol.
Concept introduction:
Empirical formula of a molecule is the smallest unit which is repeated in the molecule.
Molecular formula
Where n is the number of times the empirical formula is present in the molecular formula, n can be 1, 2, 3 etc.

Answer to Problem 196A
The empirical formula is C5H4and molecular formula is C10H8.
Explanation of Solution
% of C and H are 93.7 and 6.3 respectively.
Considering 100 g of compound, the mass of C and H is 93.7 g and 6.3 g respectively.
The molar mass of C and H is 12 g/mol and 1 g/mol respectively.
The number of moles of C and H is calculated as follows:
Moles of C
Moles of H
Smallest mole ratio C: H is as follows:
Thus empirical formula is C5H8.
Now,
Empirical formula of the molecule is C5H4 and molecular formula is C10H8.
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