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Molecular composition 


  • Molecular composition refers to the arrangement , type  and ratio of atoms in molecules of chemical substance  and chemical substance varies  when chemicals are added or  subtracted from substance when the ratio of substances changes or when other chemical changes occur.


  • A chemical is defined as a substance with a distinct chemical makeup and structure. 


  • Chemicals can exist in a variety of states, such as solid or liquid. They can change their condition as a result of several circumstances such as pressure, temperature, and so on.


  • The chemist Joseph Proust laid the way for the Law of Constant Composition, which is a foundation of contemporary chemistry. 


  • A chemical substance's makeup is predetermined. “All samples of a compound have the same composition,” Proust concluded, “i.e., all samples have the same  proportion, by mass, of the elements present in the compound.”


  • The molecular composition of a molecule can be represented as the empirical and molecular formula of the compound. 


  • Empirical formula represents the bonded atoms with the simplest whole number. It does not indicate the exact number of atoms in the molecule bonded. 


  • Molecular formulas represent the exact number of atoms present in the molecule.  The mass percent of each element and empirical formula can be used to interpret the molecular formula.



Molecular Composition Questions


Question 1: Molecular composition  is the ____________ of atoms in molecules of chemical substance.

(a) Arrangement

(b) Chemical properties

(c) Type of atoms

(d) Both 1 and 3

Solution : Molecular composition is the arrangement and type of atoms in molecules of a chemical substance.

Answer  : (d)

Question 2: Chemical composition  is the  ratio of ____________ changes occurring in chemical reaction.

(a) Physical

(b) Chemical

(c) Temporary

(d) Both physical and chemical changes.

Solution : Chemical composition is the ratio of chemical changes occurring in chemical reaction. 

Answer : (b)


Question 3: Write the empirical formula of the given molecular formula.

(a) C6H6 

(b) C2H5OH  

(c) C6H12O6  

Answer: The empirical formula of any molecular formula represents the simplest whole number ratio of all bonded elements. Thus, the empirical formula must be:

(a) C6H6 = CH 

(b) C2H5OH  = C2H6O 

(c) C6H12O6  = CH2O


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