Question

why is it necessary to accommodate vapour pressure when calculating the partial pressure of oxygen?

Answer 1

according to the Dalton's law i.e. the law of partial pressure, states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases in a mixtures.

here, u asked to calculate vapour pressure, vapour is a mixture of gases. that's why we need to calculate partial pressures of each gases in it.

hope it's helpful.

Answer 2

Partial pressure is calculated by calculating the individual pressure of each in a mixture of gases.Since vapour is a mixture of gases so we need to calculate the vapour pressure first.