Gas Density

Question 1: Define the density of the gas.

Answer:

Density is referred to as the ratio of the mass per unit of volume of a substance under specific conditions of pressure and temperature. Mathematically, it can be defined as mass divided by volume. It is generally represented by “ρ” or “D”. 

Density (ρ) = m/V

Where “m” is the mass, and “V” is the volume.

Question 2: What is the effect of pressure and temperature on the density of gas?

Answer:

The density of a substance varies depending on its pressure and temperature. For example, the density of an ideal gas can be doubled as the pressure doubles or by halving its absolute temperature. That means the density of gas always increases as the pressure increases and decreases as the temperature increases.

Question 3: What is meant by an ideal gas? Write down the ideal gas density formula.

Answer: 

The gas that strictly follows Boyle’s law, Charles’ law, and Avogadro’s law is known as an ideal gas. It is a hypothetical gas that is proposed to simplify the calculations. Many real gases behave qualitatively like an ideal gas under various conditions of temperature and pressure, where the gas molecules act as the ideal particles.

Ideal gas density formula

ρ = PM/RT

Where “P” is the pressure of the gas,

“M” is the molar mass (g/mol),

“R” is the universal gas constant (R = 0.082 L⋅ atm⋅ K⁻¹⋅ mol⁻¹), and

“T” is the temperature of the gas (K)

Question 4: What are units of measurement of density?

Answer: 

The SI unit of density of a substance is kilogram per cubic meter (kg/m³). Some other units of measurement of density are kilogram per liter (kg/L), gram per milliliter (g/mL), tonne per cubic meter (t/m³), etc.

Density is referred to as the ratio of the mass per unit of volume of a substance under specific conditions of pressure and temperature. Mathematically, it can be defined as mass divided by volume. It is generally represented by “ρ” or “D”. The density of a substance varies depending on its pressure and temperature. For example, the density of an ideal gas can be doubled as the pressure doubles or by halving its absolute temperature. That means the density of gas always increases as the pressure increases and decreases as the temperature increases. We can determine the molar mass of a substance if we know its density. Generally, the density of a substance is different for different materials. At standard conditions for temperature and pressure, osmium and iridium are the densest known elements.

Density (ρ) = m/V

Where “m” is the mass, and “V” is the volume.

The SI unit of density of a substance is kilogram per cubic meter (kg/m³). Some other units of measurement of density are kilogram per liter (kg/L), gram per milliliter (g/mL), tonne per cubic meter (t/m³), etc.