In a gas mixture of hydrogen and oxygen, steady state equimolar counter diffusion is occurring at a total pressure of 100 kPa and temperature of 20°C. If the partial pressures of oxygen at two planes 0.01 m apart, and perpendicular to the direction of diffusion are 15 kPa and 5 kPa, respectively and the mass diffusion flux of oxygen in the mixture is 1.6 * 10–5 kmol/m2.sec, calculate the molecular diffusivity for the system.

• A. For equimolar counter current diffusion:
• B. 2.898×10-5 m2/sec
• C. 3.898×10-5 m2/sec
• D. 2.989×10-5 m2/sec
• E. 3.989×10-5 m2/sec