Percentage Composition


 
 
Concept Explanation
 

Percentage Composition

Percentage Composition: The percentage composition of elements in a compound is calculated from the molecular formula of the compound. The molecular mass of a compound is calculated from the atomic masses of various elements. Percentage ;mass ;of ;the ;element =frac{Total ;;mass;; of;; element}{Molecular;; mass}X100

Illustration: Calculate the percentage by mass of different elements of water (H_2O).

Solution: Consider (H_2O) molecule. Molar mass of Hydrogen(H) = 2g and Molar mass of Oxygen (O) = 16g. 

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Sample Questions
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Question : 1

Calculate the percentage by mass of Chlorine in HCl.

Right Option : C
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Question : 2

A compound is 25.9% nitrogen and 74.1% oxygen. Find its empirical formula.

Right Option : D
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Question : 3

The percentage of hydrogen in H_2O is -

Right Option : B
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