1g/mL
Density is an intensive property so no matter the amount of water, its density is always the same.
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500 cubic centimetres of water weighs 500 grams
The density of something does not depend on the amount of the substance you have, the density of 1 gram of water is the same as the density of 100000000 grams of water. The density of pure water at standard temperature and pressure is 1.
The answer depends on the substance being measured. Water, for instance, has a density of 1 gram per cubic centimeter. Therefore, multiplying seventy cc of water times the density of one gram / cc would yield 70 grams of water. Simply multiply the substance's density (in grams per cc or grams per mL as 1 mL = 1 cc) by 70 to get your answer.
The density would be 25/500 =0.05 g/mL This is a totally unlikely result since the rock has roughly one twentieth the density of water!
Without a density or substance to work with, this cannot be determined. If it is water, that would be 1KL for 1,000,000 grams.