The mass of some substance taken in a volume of 0.2 cm³ is 3.86 g. What kind of substance is this?

Initial data: V (volume occupied by an unknown substance) = 0.2 cm ^ 3; m (mass of unknown substance) = 3.86 g.

To determine the type of substance, it is necessary to find out the ratio of its mass to the volume it occupies and find a suitable value from the density tables.

ρ = m / V = 3.86 / 0.2 = 19.3 g / cm ^ 3 or 19.3 * 10 ^ 6/10 ^ 3 kg / m ^ 3 = 19,300 kg / m ^ 3.

Gold has a given density of 19,300 kg / m ^ 3.

Answer: Some substance is gold.