Solve these

Given:
Density ($\rho$) = 1.2 g/mL
Volume (V) = 50 mL
Unknown: Mass (m)

The formula for density is $\rho = \frac{m}{V}$.
To find mass, rearrange the formula: $m = \rho \times V$.

$m = 1.2\ \text{g/mL} \times 50\ \text{mL}$
$m = 60\ \text{g}$

The mass of the substance is 60\ g.

Given:
Mass (m) = 150 g
Density ($\rho$) = 0.75 g/mL
Unknown: Volume (V)

The formula for density is $\rho = \frac{m}{V}$.
To find volume, rearrange the formula: $V = \frac{m}{\rho}$.

$V = \frac{150\ \text{g}}{0.75\ \text{g/mL}}$
$V = 200\ \text{mL}$

The volume of the substance is 200\ mL.