Question

An unknown liquid occupies a volume of $5$mL and has a mass of $40$ grams. How do you find the density?

Answer 1

Hint:To answer this question we should know the density formula. We can determine the density of the liquid by dividing the mass of the liquid by the volume of the liquid. We have mass and volume. By substituting the mass and volume we can determine the density of the unknown liquid.

Complete step-by-step solution:Density is the measurement of mass per volume.
The formula of density is as follows:
Density = mass/ volume
The given volume of the liquid is $5$mL and mass of liquid is $40$ grams.On substituting $5$ mL for volume and $40$ grams for mass of the liquid,
Density = $40$ grams/$5$mL
Density = $8$ grams/mL
So, the density of the unknown liquid is $8$ grams/mL.

Additional information:At STP, Osmium and Iridium are the densest elements. The increase in the mass of the substance does not increase the density of the substance, so density is an intensive property.Hydrometer, pycnometer and hydrostatic balance, etc. A pycnometer is used to measure the density of liquid and solid. Mass divided by the bulk volume gives the bulk density. Pressure and temperature affect the density. Increasing the pressure increases the density. Increasing the temperature decreases the density.

Therefore, the $8$ grams/mL is the answer.

Note:The SI unit of density is Kilogram per meter-cube. The CGS unit of density is gram per centimetre-cube. The properties that do not change with mass are known as intensive properties. The units are important. Here, we calculate the density in grams per mL. We can also write it as Kg per litre.