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13g
The density of a substance is calculated by dividing its mass by its volume. In this case, the mass of the quartz is 13g and its volume is 5cm³. Therefore, the density of the quartz can be calculated as 13g / 5cm³ = 2.6 g/cm³.
It is an expression that can be simplified to: 2g -8
69 cubic centimeters squared
1 kilogram = 1000 grams. 10000 milligrams = 10 grams. 1 kg is 100 times the mass of 10000 mg.