The estimated average concentration of NO₂ in air in the United States in 2006 was 0.016 ppm. (a) Calculate the partial pressure of the NO₂ in a sample of this air when the atmospheric pressure is 755 torr (99.1 kPa).

Video transcript

Hi everyone here we have a question telling us that the average amount of methane in the atmosphere is 1.87 parts per million. If a sample of air has a total pressure of 760 of mercury, what is the partial pressure of methane in the sample? So one part per million Means one part of salute. For every 10 6th parts of solution, it can be written as PPM equals moles, a solid divided by moles and mixture Times 10 to the 6th. So we have 1.87 parts per million of missing, Which equals 1.87 moles of methane for every 10 to the sixth molds of air, Which equals 1.8, 7 Times 10 to the - equals our mole fraction of methane. So our pressure of our gas is going to equal our mole fraction of our gas times the pressure of the total. So the pressure of methane Equals 1.87 Times 10 to the negative 6th Times 760 toured. So the pressure of methane Equals 1.4, 2 Times 10 to the -3 Tour. And that is our final answer. Thank you for watching. Bye.