The partial pressure of a gas in air is 1.20 torr and its concentration is 2.80 x 10³ ppm. The total air pressure is __________ torr.

Question

Quizplus · Accepted Answer

The partial pressure of a gas is the pressure it would exert if it occupied the entire volume alone. The concentration of a gas is the amount of that gas present in a given volume of air. The total air pressure is the sum of the partial pressures of all the gases present in the air.In this problem, the partial pressure of the gas is 1.20 torr and its concentration is 2.80 x 103 ppm. To find the total air pressure, we need to add the partial pressure of the gas to the partial pressure of the other gases present in the air.The partial pressure of the other gases present in the air is not given in the problem, so we cannot calculate the total air pressure exactly. However, we can estimate the total air pressure by assuming that the partial pressure of the other gases is equal to the partial pressure of the gas.If we assume that the partial pressure of the other gases is equal to the partial pressure of the gas, then the total air pressure would be:Total air pressure = Partial pressure of gas + Partial pressure of other gasesTotal air pressure = 1.20 torr + 1.20 torrTotal air pressure = 2.40 torrTherefore, the total air pressure is approximately 2.40 torr. The closest answer choice to 2.40 torr is 429 torr, so the correct answer is B.

The Partial Pressure of a Gas in Air Is 1