Dalton's Law of Partial Pressures
(1) According to this law, “When two or more gases, which do not react chemically are kept in a closed vessel, the total pressure exerted by the mixture is equal to the sum of the partial pressures of individual gases.”
Thus, Ptotal = P1P2 P3 + ……..
Where P1P2 P3 are partial pressures of gas number 1, 2, 3 .........
(2) Partial pressure is the pressure exerted by a gas when it is present alone in the same container and at the same temperature.
Partial pressure of a gas
(3) If a number of gases having volume P1P2 P3 at pressure P1P2 P3 are mixed together in container of volume V, then,