Question

What is Dalton’s law of partial pressure?

Answer 1

The law was formulated by John Dalton in 1801. It states that the total pressure exerted by the mixture of non-reactive gases is equal to the sum of the partial pressures of individual gases i.e., the pressures which these gases would exert if they were enclosed separately in the same volume and under the same conditions of temperature. In a mixture of gases, the pressure exerted by the individual gas is called partial pressure.

Mathematically, P_total = P₁ + P₂ +P₃ (at constant T,V)

Where P_total is the total pressure exerted by the mixture of gases and P₁, P₂, P₃ etc. are partial pressures of gases.

Or

According to Dalton’s law of partial pressure, “Total exerted pressure by mixture of all non-reactive gases is equal to the sum of partial pressure of all individual gases.”

At constant temperature T and volume V P_total = P₁ + P₂ + P₃
Where, P_total = total exerted pressure of mixture of all gases.
P₁, P₂, P₃ etc. is pressure exerted by individual gases known as partial pressure.