Choose the appropriate answer, from the list, for the following questions. Justify your selections: i- The ratio of a mass concentration of species A to the total mass density of the mixture is known as: a) Mass density b) Concentration c) Mole fraction d) Mass fraction ii- A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300K. If the total pressure of the mixture is 1=105N/m2, find the average molecular weight of the mixture: a) 28.84 b) 29.84 c) 30.84 d) 31.84 iii- Which among the following is always true for mass transfer to occur? a) Difference in concentration b) Difference in Pressure c) Difference in temperature d) Difference in chemical potential iv- A gas mixture containing 21%O2 and 79%N2 flows through a pipe of circular cross-section of diameter 2cm at atmospheric pressure. The velocity of O2 is 0.04m/s and N2 is 0.035m/s. What is the value of molar average velocity (m/s) of the mixture? a) 0.036 b) 0.035 c) 0.034 d) 0.033 v- For the same gas mixture in iv, what will be the value of mass average velocity (m/s) ? a) 0.981 b) 0.891 c) 0.985 d) 0.857 vi- A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5mol/ liter. An observer is running in (x) direction with a velocity of 2m/s. calculate the value of molar flux (mol/m2s) relative to the observer. a) 0.015 b) 15 c) 1.015 d) 1015 Choose the appropriate answer, from the list, for the following questions. Justify your selections: i- The ratio of a mass concentration of species A to the total mass density of the mixture is known as: a) Mass density b) Concentration c) Mole fraction d) Mass fraction ii- A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300K. If the total pressure of the mixture is 1=105N/m2, find the average molecular weight of the mixture: a) 28.84 b) 29.84 c) 30.84 d) 31.84 iii- Which among the following is always true for mass transfer to occur? a) Difference in concentration b) Difference in Pressure c) Difference in temperature d) Difference in chemical potential iv- A gas mixture containing 21%O2 and 79%N2 flows through a pipe of circular cross-section of diameter 2cm at atmospheric pressure. The velocity of O2 is 0.04m/s and N2 is 0.035m/s. What is the value of molar average velocity (m/s) of the mixture? a) 0.036 b) 0.035 c) 0.034 d) 0.033 v- For the same gas mixture in iv, what will be the value of mass average velocity (m/s) ? a) 0.981 b) 0.891 c) 0.985 d) 0.857 vi- A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5mol/ liter. An observer is running in (x) direction with a velocity of 2m/s. calculate the value of molar flux (mol/m2s) relative to the observer. a) 0.015 b) 15 c) 1.015 d) 1015
