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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 molar concentration of oxygen

(a) 8.42 * 10^-1 kg mol/m^3

(b) 8.42 * 10^-2 kg mol/m^3

(c) 8.42 * 10^-3 kg mol/m^3

(d) 8.42 * 10^-4 kg mol/m^3

I have been asked this question at a job interview.

My enquiry is from Concentrations, Velocities and Fluxes in division Modes and Diffusion of Mass Transfer

1 Answer

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by (39.8k points)
Correct option is (c) 8.42 * 10^-3 kg mol/m^3

The explanation is: 0.21 * 10 ^5/8341 * 300 = 8.42 * 10 ^-3 kg mol/m^3.

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