A flask holds a mixture of the 3 main gases in air. The masses of the nitrogen and oxygen in the mixture are given below, what is the partial pressure (in bar) of Ar if the total pressure of the gas mixture is 1.01325 bar and the total moles of gases in the mixture is 4.000 mol? N2(g) O2(g) 87.49 g 26.82 g Ar(g)=? ? PA=? b) 3 points A 1.00 L sealed flask is placed in an ice-water bath and is filled with oxygen gas maintained at STP conditions. A heater is inserted in the water bath raising the temperature of the water to the boiling point: 100 C. What is the final pressure in bar of the oxygen in the sealed flask? A sample of oxygen gas at high pressure and high temperature (P-O>>>Patm (T-O>>>298 K) is measured to have a compressibility factor that is greater than 1. Which statement below most accurately describes the physical reason for the deviation from ideal behavior for oxygen under these conditions. Briefly justify your choice. A) The intermolecular forces dominate over the excluded volume effect B) The excluded volume effect dominates over the intermolecular forces C) The intermolecular forces and the excluded volume effects both contribute equally D) The intermolecular forces go to zero at high temperature