Relation Between Empirical and Molecular Formulae


 
 
Concept Explanation
 

Relation Between Empirical and Molecular Formulae

The empirical formula of a compound gives the simplest whole-number ratio of the atoms of the elements present in a molecule of the compound. For example, the empirical formula of benzene (C_6H_6) is CH, while that of hydrogen peroxide (H_2O_2) is HO. The empirical formula does not represent the actual formula of the compound

Molecular or chemical formula: A molecular formula is a representation of a chemical compound using a set of symbols for the atoms of elements present in a molecule of the compound, and shows the actual number of atoms of each element of the compound. In some cases, empirical and molecular formulas are same, e.g., methane (CH_4), boron trichloride (BCl_3), etc.

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Sample Questions
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Question : 1

Which of the following statement / statements are correct :

(a) The empirical formula of Benzene is CH and Molecular formula of Benzene is C6H6.

(b) The empirical formula of Hydrogen peroxide is H2O2 and Molecular formula is HO.

Right Option : A
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Question : 2

Which of the following are correct :

(a) The empirical formula of a compound gives the simplest whole-number ratio of the atoms of the elements present in a molecule of the compound.

(b) The empirical formula and molecular formula of Methane is CH4.

Right Option : C
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Question : 3

The empirical formula of a compound gives the simplest ____________ number ratio of the atoms of the elements present in a molecule of the compound.

Right Option : A
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