please help, I don't understand chemistry at all.
Density is a physical property of a molecule that’s measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3
).

Question

11-10-2021
Chemistry

contestada

please help, I don't understand chemistry at all.
Density is a physical property of a molecule that’s measured as mass per unit volume.
(a) Given that density is usually expressed in the units of g/cm3
, calculate the density of a cube of plastic that
has a mass of 2.331 g and an edge length of 1.500 cm (volume of a cube is V = l^3
).

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rspill6 rspill6 · Answer 1 · 2021-10-16T11:55:12+02:00

Answer:0.691 g/cm^3

Explanation: Density tells us how much mass there is per unit volume of a material. If one has a density of 2 g/cm^3, then a 2 cm^3 chuck of it whould have a mass of (2 g/cm^3)*(2 cm^3) = 4 g.

Since the plastic is in the form of a cube, we can calculate it's volume with the relationship V = l^3, where l is the length. (A box would have a volume of lengthx width x height, but for a cube, l=w=h, so the equation becomes V = l^3.

The colume of the plastic cube is (1.5cm)^3 or 3.375 cm^3. Since this cube has a mass of 2.331 g, we can divide that mass by the cube's volume to find density:

(2.331 g)/(3.375 cm^3) = 0.691 g/cm^3