Molecular Mass and Relative Molecular Mass


 
 
Concept Explanation
 

Molecular Mass and Relative Molecular Mass

Molecular Mass:

The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance. It is therefore, the relative mass of a molecule expressed in atomic mass units (u).

Illustration : The relative molecular mass of water H_2O is 18 u, which can be calculated as

           Atomic mass of Hydrogen= 1u        

          Atomic mass of oxygen    =16u

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Sample Questions
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Question : 1

The percentage by weight of Z in white vitriol, ZnSO_4.7H_2O (Zn = 65, S = 32, O = 16, H = 1), is approximately

Right Option : A
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Question : 2

Which of the following statement / statements are correct :

(a) Molecular mass of sulphuric acid is 98 u.

(b) Molecular mass of ammonia is 17 u.

Right Option : C
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Question : 3

Determine the molecular mass of ammonia (NH3) ?

Right Option : C
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