Question

How do you determine the density of a gas?

Answer 1

The density of a substance is defined as the mass per volume. The unit of density is gram per cubic centimeter or represented as $g/c{m^3}$. The density of a substance is calculated by dividing the mass by the volume.

Complete step by step answer:
The density of the solids are easy to understand as they can be physically felt. The density is defined as the physical property which is determined by dividing the mass of the object by the volume.
The mass is defined as the measure of the amount of matter present in an object. The mass is measured in terms of grams. The volume is the three-dimensional space an object can occupy. The volume is measured in terms of cubic meters.
The formula of density is given as shown below.
$D = \dfrac{m}{V}$
D is the density
m is the mass
V is the volume.
One way to know the density is to fill the syringe of known mass and volume with the gas and then find out the mass of the gas. After that density can be obtained by using the formula.
For calculating the density of the ideal gas, an ideal gas density formula is used.
$\rho = \dfrac{{MP}}{{RT}}$
Where,
$\rho$ is the ideal gas density in terms of Kg/L.
P is the pressure in atm
M is the molar mass in g/mol.
R is the universal gas constant
T is the temperature of the gas in kelvin.

Note:
The mass of the gas is obtained from the syringe by subtracting the mass of the empty syringe by the total mass of the syringe after filling the syringe with the gas.