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1000 grams = 1 kilogram so 21 g = 21/1000 = 0.021 kg. Simple!
336 grams.
Density = Mass/Volume = 84g / 21 cc = 4 grams per cubic centimetre.
1 kg = 1,000 grams 2 kg = 2,000 grams 2.1 kg = 2,100 grams
500 grams