A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ^5 N/m^2, find overall mass density
(a) 4.156 kg/m^3
(b) 3.156 kg/m^3
(c) 2.156 kg/m^3
(d) 1.156 kg/m^3
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Query is from Concentrations, Velocities and Fluxes in chapter Modes and Diffusion of Mass Transfer