Calculate the mole fraction of ${\mathrm{N}}_2$ gas in a mixture of ${\mathrm{N}}_2$ and ${\mathrm{O}}_2$ If the partial pressure of ${\mathrm{O}}_2$ is 63 of Hg and the total pressure of the mixture is 90 cm of Hg First multiply your answer with 10, then fill OMR.