Question

what is a density of a certain material whose mass is 172g and displaxes 20ml of water ?

Answer 1

We can find the density of a certain material from the formula:

$$\rho = \dfrac{m}{V},$$

here, $m$ is the mass of the material, $V = V_{displaced}$ is the volume of the material (which is equal to the volume of displaced water).

Then, we get:

$$\rho = \dfrac{m}{V} = \dfrac{172g \cdot \dfrac{1 kg}{1000 g}}{20 mL \cdot \dfrac{1L}{1000mL} \cdot \dfrac{1m^3}{1000L}} = 8600 \dfrac{kg}{m^3}.$$

Answer:

$\rho = 8600 \dfrac{kg}{m^3}.$