A gas mixture contains oxygen, nitrogen, and helium. The partial pressures are:

Po, = 20.0 kPa, PN, = 46.7 kPa and Phe = 26.7 kPa.

What is the total pressure of the gas?

A. 46.7 kPa

B. 6.70 kPa

C. 2.49 x 104 kPa

D. 93.4 kPa

93.4 kPa

Explanation: According to Dalton law of partial pressure, the total pressure of a mixture of gases is equivalent to the sum of partial pressures of individual gases. That is, P (total) = P₁ + P₂ + P₃, where P₁, P₂ and P₃ are partial pressures of individual gases.

In this case,

P (Po) = 20.0 kPa

P (PN) = 46.7 kPa

P (Phe) = 26.7 kPa

Therefore, the total partial pressure will be;

P (total) = 20.0 kPa + 46.7 kPa + 26.7 kPa

= 93.4 kPa

Therefore, the total pressure of the ga mixture is 93.4 kPa