And atmospheric pressure is one ATM or 760 mercury. So defined partial pressure of oxygen, we simply multiply mole fraction by our total pressure and we get 159.6 mmhg for oxygen and 600.4
mmhg for nitrogen. So second step is to find the Molarity. We can use these guys, the partial pressures to find the Molarity. Now, Henry's loss states. So we can find the Molarity by simply taking our constant and multiplying it by the partial pressure of the gas.