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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 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

This question was posed to me in an interview.

Query is from Concentrations, Velocities and Fluxes in chapter Modes and Diffusion of Mass Transfer

1 Answer

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by (39.8k points)
The correct choice is (d) 1.156 kg/m^3

To elaborate: For oxygen = 0.269 kg/m^3 and for nitrogen = 0.887 kg/m^3.

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