Answer:
Density,
![d=0.82\ g/cm^3](https://img.qammunity.org/2021/formulas/chemistry/high-school/tsdlccrec1vh0fn8orn5jdzzxx48ey00st.png)
Step-by-step explanation:
It is given that,
Mass of unknown liquid is 20.5 kg
Volume, V = 25 mL
We know that, 1 mL = 1 cm³
25 mL = 25 cm³
The density of the substance is equal to its mass per unit volume. So,
![d=(m)/(V)\\\\d=(20.5\ g)/(25\ cm^3)\\\\d=0.82\ g/cm^3](https://img.qammunity.org/2021/formulas/biology/high-school/8fe7v9loeszmpnrmx0l5vcx6w6oe5ayx6s.png)
So, the density of this substance is
.