A vessel is filled with a mixture of oxygen and nitrogen. At what ratio of the partial pressures will the masses of the gases be identical?

• A

  ${\mathrm{p}}_{{\mathrm{O}}_2}={\mathrm{p}}_{{\mathrm{N}}_2}$

• B

  ${\mathrm{p}}_{{\mathrm{O}}_2}=0.875{\mathrm{p}}_{{\mathrm{N}}_2}$

• C

  ${\mathrm{p}}_{{\mathrm{O}}_2}=1.14{\mathrm{p}}_{{\mathrm{N}}_2}$

• D

  ${\mathrm{p}}_{{\mathrm{O}}_2}=2{\mathrm{p}}_{{\mathrm{N}}_2}$