density
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The density (1,4 g/cm3) is a physical property.
Density of 1.738 g/cm3 at 20 oC is a physical property.
In this case, the element with a density of 3.0 g/cm3 is likely to be aluminum (Al). Aluminum has a density of approximately 2.7 g/cm3, which is close to 3.0 g/cm3.
The density of the substance can be calculated by dividing the mass (31 g) by the volume (68 cm3). So, density = mass/volume = 31 g / 68 cm3 ≈ 0.46 g/cm3.
Density is an example of an intensive property, which means it does not depend on the amount of material present. It is a measure of how much mass is contained within a given volume of a substance, and is typically expressed in units such as grams per cubic centimeter.