Question

A piece of coal has a mass of 40 g and volume of 30 cm${}^3$. The relative density is equal to_______.

• A. 1.0
• B. 1.33
• C. 1.22
• D. 1.5

Answer 1

The correct option is B

1.33

mass = 40 g, volume = 30 cm${}^3$

So, density of coal = Mass/volume = 40/30 = 1.33 g/cm${}^3$

Relative density of coal = density of coal/ density of water at 4${}^{\circ }C$

= 1.33 g/cm${}^3$/1 g/cm${}^3$ = 1.33

Thus, the relative density of coal is 1.33.