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How do you express the percentage composition?

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The concentration of a Solution may also be expressed in terms of percentage in the following way. 

1. % weight by weight (w/w): 

it is given as mass of solute present in per 100 gm of Solution.

2. % weight by volume (w/v): 

It is given as mass of solute present in per 100 ml of Solution

3. % volume by volume (V/V): 

It is given as volume of solute present in per 100 ml Solution

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