Relating Mole Fractions and Partial Pressures

A study of the effects of certain gases on plant growth requires a synthetic atmosphere composed of 1.5 mol % CO2, 18.0 mol % O2, and 80.5 mol % Ar. (a) Calculate the partial pressure of O2 in the mixture if the total pressure of the atmosphere is to be 745 torr. (b) If this atmosphere is to be held in a 121-L space at 295 K, how many moles of O2 are needed?

A 4.0-L vessel containing N2 at STP and a 2.0-L vessel containing H2 at STP are connected by a valve. If the valve is opened allowing the two gases to mix, what is the mole fraction of hydrogen in the mixture? (a) 0.034, (b) 0.33, (c) 0.50, (d) 0.67,

(e) 0.96.

Problem 1PERelating Mole Fractions and Partial PressuresA study of the effects of certain gases on plant growth requires a synthetic atmospherecomposed of 1.5 mol % CO2, 18.0 mol % O2, and 80.5 mol % Ar. (a) Calculate the partialpressure of O2 in the mixture if the total pressure of the atmosphere is to be 745 torr. (b) If thisatmosphere is to be held in a 121-L space at 295 K, how many moles of O2 are needed.A 4.0-L vessel containing at STP and a 2.0-L vessel containing at STP areconnected by a valve. If the valve is opened allowing the two gases to mix, what is the molefraction of hydrogen in the mixture (a) 0.034, (b) 0.33, (c) 0.50, (d) 0.67, (e) 0.96. Step by step solutionStep 1 of 3The number of moles of the gas can be calculated by the following formula. ........................................(1) P = Pressure of the gas V = Volume of the gas T = Temperature of the gas n = Number of moles of the gas R = Gas constant.Rearrange the equation is as follows. .....................................(2)