If 7.000g of a solid displaced 21.0 mL of water when dropped into a graduated cylinder, what is the density of the solid?

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Correct Answer: **C.** *0.333 g/mL*

Density is calculated by dividing the grams of a substance by the volume it displaces, in either mL or L. In this case the density would be calculated as: 7.000g / 21.0mL = 0.333 g/mL

Note: The correct answer must have 3 significant digits because the 21.0 mL number used in the calculation had 3 significant digits. The rule for multiplying and dividing significant digits is the answer must have the same number of significant digits as the number with the least amount of significant digits.

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