text: gas question for chem? at 0°c a 1.00 l flask contains 1.80  10-2 mol n2, 4.80  102 mg o2, and no at a concentration of 9.00  1018 molecules/cm3. what is the partial pressure of each gas, and what is the total pressure in the flask? please explain partial pressure:  for each gas assume that it is alone in the volume v at the temperature t.  use p = nrt/v where n are the moles of each specific gas.  the total pressure is the sum of the partial pressures.