Dry air near sea level has the following composition by volume: N2, 78.08 percen

Question

Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. (Hint: Since volume is proportional to the number of moles present, mole fractions of gases can be expressed as ratios of volumes at the same temperature and pressure.) (a) Calculate the partial pressure of each gas in atm. PN2 atm PO2 atm PAr atm PCO2 atm (b) Calculate the concentration of each gas in moles per liter at 0

Explanation / Answer

Dry air near sea level has the following composition by volume: N2, 78.08 percent; O2, 20.94 percent; Ar, 0.93 percent; CO2, 0.05 percent. The atmospheric pressure is 1.00 atm. (Hint: Since volume is proportional to the number of moles present, mole fractions of gases can be expressed as ratios of volumes at the same temperature and pressure.) (a) Calculate the partial pressure of each gas in atm. PN2 ? atm PO2 ? at, PAr ?atm PCO2 ? atm 1) the partial pressures are just the percentage of the total pressure if you assume the gasses are all ideal gasses i.e. PO2 = .2094 atm 2) concentration can be got by reorganizing the ideal gas law - rearrange and plug in: n/V=P/RT

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