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Define mass percentage, volume percentag...

Define mass percentage, volume percentage and mass to volume percentage solutions.

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i) Mass percentage : The mass percentage of a component of a solution is defined as the
`"mass"% =("Mass of the component in the solution")/("Total mass of the solution")xx100`
ii) Volume percentage `((v)/(V))` : It is defined as the volume % of a component
`=("Volume of the component")/("Total volume of solution")xx100`
iii) Mass to volume percentage `((w)/(V))` : It is defined as the mass of solute dissolved in 100 ml of the solution.
`to` It is commonly used in medicine and pharmacy.
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