A gas has a mixture containing oxygen, nitrogen, & carbon dioxide has a total pressure of 32.0 kPa. If oxygen = 6.6 kPa, nitrogen = 23.0 kPa, what is the pressure of the carbon dioxide?

2.4 kPa.

Explanation:

According to Dalton's law: the total pressure of an ideal gas mixture is equal to the sum of the partial pressures of the gases in the mixture.

Herein;

Ptotal = P of O₂ + P of N₂ + P of CO₂.

where, Ptotal is the total pressure = 32.0 kPa,

P of O₂ is partial pressure of oxygen gas = 6.6 kPa,

P of N₂ is the partial pressure of nitrogen gas = 23.0 kPa,

P of CO₂ is the partial pressure of carbon dioxide gas = ? kPa.

∵ Ptotal = P of O₂ + P of N₂ + P of CO₂.

∴ 32.0 kPa = 6.6 kPa + 23.0 kPa + P of CO₂.

∴ P of CO₂ = 32.0 kPa - (6.6 kPa + 23.0 kPa) = 2.4 kPa.