Mass Transfer Practice Test 1

1. What is the molecular volume of air at normal boiling point?

2. Sherwood number is given by

3. A reaction 3A+2B+C=1.5D+E occurs in a reactor at steady state. What will be the value of the flux ratio N_A/N_D

4. For the calculation of Mass average velocity, which velocity of the molecule is used?

5. For what kind of mixtures D_AB=D_BA holds?

6. The mass transfer by convection can take place under how many conditions?

7. 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/m², find molar fraction of nitrogen

8. What is the value of Schmidt number for hydrogen?

9. Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.
For ammonia,
Molecular weight = 17
Molecular volume = 25.81 cm³/gm mole
For air,
Molecular weight = 29

10. In the expression for molar flux N_A=(N_A+N_B)C_A/C - D_ABdC_A/dz, the terms representing bulk flow and molecular diffusion are, respectively