Apermeation membrane separates an inlet air stream, f, (79 mol% n2, 21 mol% o2), into a permeate stream, m, and a reject stream, j. the inlet stream conditions are 293 k, 0.5 mpa, and 2 mol/min; the conditions for both outlet streams are 293 k and 0.1 mpa. if the permeate stream is 50 mol% o2, and the reject stream is 13 mol% o2, what are the volu- metric flowrates (l/min) of the two outlet streams?

Explanation:

Using the law of mass conservation, we have that the moles of any component in the inlet air stream equals the moles of this compenent in the two outlets stream. Being A the mole flowrate for the permeate stream and B the mole flowrate for the reject stream (both in mol/min), we have equation (1) and (2):

2 mol/min * 0,21 = A mol/min * 0,50 + B mol/min * 0,13    ......................(1)

0,42 = 0,5A + 0,13B...........................(1)

2 mol/min * 0,79 = A mol/min * 0,50 + B mol/min * 0,87    ......................(2)

1,58 = 0,5A + 0,87B...........................(2)

Solving this system:

1,58 = 0,5A + 0,87B...........................(2)

0,42 = 0,5A + 0,13B...........................(1)

1,16 = 0A + 0,74B...............................(2) - (1)

1.16=0,74B

1,16/0,74=B

B=1,57 mol/min

And now replacing B in equation (1):              

1,58 = 0,5A + 0,87*1,57

1,58-1,37=0,5A

0,21/0,5=A

A=0,43 mol/min

To calculate the volumetric flowrate of the permeate stream (M) and the reject stream (J), we just replace the given and calculate data into the ideal gas equation:

PV=nRT,.................... V = nRT/P

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.