Explain why density is more useful for identifying a substance than either mass or volume

Mass and volume are extrinsic properties.

A pail may contain water that is  1 kg  in mass and  1 L  in volume.

A drop of water may be  1 g  in mass and  1 mL  in volume.

Both are water, but they have different mass and volumes. Therefore you can't identify whether a substance is water just by measuring its mass and volume.

However, the ratio of the mass to volume (density) can be used to identify substances.

c) always accurate

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answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;