A situation arises where steady state equimolar counter diffusion is occurring in a section of pipeline carrying natural gas (mostly methane (A) and ethane (B)). The total pressure is100 kPa and...

Extracted text: A situation arises where steady state equimolar counter diffusion is occurring in a section of pipeline carrying natural gas (mostly methane (A) and ethane (B)). The total pressure is100 kPa and temperature of 20°C. If the partial pressures of methane at two planes 2 cm apart, and perpendicular to the direction of diffusion are 25 kPa and 15 kPa, respectively, and the mass diffusion flux of methane in the mixture is NA =1.6 x 10 -5 kmol/m2.sec, what is the molecular diffusivity DAR for the system? O 6.14 x10 -3 m 2/sec O 7.80 x10 -8 m 2/sec O 7.80 x 10-5 m 2/sec O 6.14 x10 -8 m 2/sec O 7.80 x10 -3 m 2/sec O 6.14 x10 -5 m 2/sec O None of these