What do you mean by the "concentration" of a substance?

It is the measure of undissolved substances

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It refers to the impurities

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Concentration refers to the amount of substance per defined space

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It means total mass of the un dissolved gases

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Solution

The correct option is C Concentration refers to the amount of substance per defined space
concentration refers to the amount of a substance per defined space.
Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration usually is expressed in terms of mass per unit volume.

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