Look atomic the given formula of the hydrocarbon and find out the (a) number of carbon atoms and (b) number of hydrogen atoms and proceed as follows:
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For ionic compound, such as, sodium chloride, there is no discrete individual molecule. Instead, these are the aggregates represented by a formula of the type..
A molecular formula is the shorthand notation of a substance. For example, carbon dioxide is written as CO2. The formula CO2 is much shorter than the name carbon dioxide.
Empirical formula of a substance represents mass of the substance equal to the formula mass of the substance. The formula mass of the substance is equal to the sum of the atomic masses of all the atoms present in the empirical formula.
The molecular formula of a compound is related to its empirical formula as follows: Molecular formula = n × Empirical formula, where, n may be 1, 2, 3 … thus the value of n can be obtained by the following relationship.
The chemical formula of a compound can be determined from the composition of the compound. The composition of a compound is commonly expressed in terms of percentage of each element present in it.