On the average,air contains about 9.3 mL of argon per liter.What would be the partial pressure of argon in air when the barometric pressure is 780 Torr?

Question

Quizplus · Accepted Answer

The partial pressure of argon in air can be calculated using Dalton's Law of Partial Pressures, which states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases. The partial pressure of a gas is proportional to its mole fraction in the mixture. Given that air contains about 9.3 mL of argon per liter, this means argon makes up 9.3% of air by volume. Since the volume percentage can be directly related to mole percentage in a gas mixture, and the total pressure is 780 Torr, the partial pressure of argon is 9.3% of 780 Torr, which is approximately 0.093 * 780 = 72.54 Torr, rounding to the nearest option gives 7.3 Torr.

On the Average,air Contains About 9