Kanchous Valentines day took an unexpected turn when Luna rejected his confession during their date. Upon returning home, disheartened by the turn of events, he consoled himself that theres no point in crying over spilled milk. Instead, he decided to make one pitcher of milk to drown all the bitterness away.During preparation while looking at the warm water, his chemical engineering instincts kicked in$,$ prompting him to contemplate the composition of the liquid and gas phase for a mixture of air and the warm liquid water at $158$ oF at $1$ atm. Before he became consumed by the additional sorrow resulting from miscalculating the phase equilibrium problem he bothered himself with, help him solve the problem instead.Working relentlessly on the previous problem for hours, Kanchou eventually drifted into sleep without even finishing what hes supposed to do drink milk. By the time he woke up$,$ the warm water he had prepared had already cooled down to $293$K and the barometer indicated a reading of $101\mathrm{.}3$ kPa.Filled with revitalized energy from oxygenated blood running through his veins $,$ Kanchou, eager to to redeem himself from his previous setback, sets out to challenge himself once again. This time, to determine the mole fraction of oxygen in the now room temp water but exposed to dry air instead.Before solving the problem,he recalls that the Henrys law constant for oxygen dissolved in water is $4\mathrm{.}06$ x $109$ Pa $($mole of O$2$ Per total mole solution$)$ at $293$K$.$