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In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2 in O2 is 2*10-5m2/s. Calculate the Molar flux (mol/m2.s) of N2 at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10-5m3atmK-1mol-1). Assume z=0 at the top of the reactor. 
  • a)
    4.242*10-4
  • b)
    4.242*10-5
  • c)
    4.242*10-3
  • d)
    4.242*10-2
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
In order to prepare Lithium nitride, air is passed gently over a react...
Explanation:
Case: Diffusion of A through non-diffusing B
N2 in air= 79%
O2 in air= 21%
Molar flux of N2, NA=0.025mol/m2.s
Pressure of N2 at the point z=2.5cm=
( DAB*P ln⁡[(P-P5)/(P-P0)])/RTl=(DAB*P ln⁡[(P-P5)/(P-P2.5)])/RTl
P2.5=0.542atm
Velocity of N2= NART/P2.5=112.78*10-5m/s
Molar flux of O2-=0
Velocity of O2=0
Average molar mass=0.542*28+0.458*32=29.832
Mass average velocity= (0.542*28*112.78*10-5)/29.832=57.37*10-5m/s
Required molar flux at the distance of z=5, is
CA(uA-2V)= NA-2PAV/RT=4.242*10-4mol/m2.s.
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In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2in O2is 2*10-5m2/s. Calculate the Molar flux (mol/m2.s) of N2at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10-5m3atmK-1mol-1). Assume z=0 at the top of the reactor.a)4.242*10-4b)4.242*10-5c)4.242*10-3d)4.242*10-2Correct answer is option 'A'. Can you explain this answer?
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In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2in O2is 2*10-5m2/s. Calculate the Molar flux (mol/m2.s) of N2at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10-5m3atmK-1mol-1). Assume z=0 at the top of the reactor.a)4.242*10-4b)4.242*10-5c)4.242*10-3d)4.242*10-2Correct answer is option 'A'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2in O2is 2*10-5m2/s. Calculate the Molar flux (mol/m2.s) of N2at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10-5m3atmK-1mol-1). Assume z=0 at the top of the reactor.a)4.242*10-4b)4.242*10-5c)4.242*10-3d)4.242*10-2Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In order to prepare Lithium nitride, air is passed gently over a reactor. Suppose that Nitrogen diffuse to a length 5cm before getting reacted with Lithium. Nitrogen reacts with lithium quickly so that partial pressure of Nitrogen at that point is 0. Reactor is a cylinder of length 10cm and diameter 2cm. Assume air to be a mixture of Nitrogen and Oxygen only. The temperature is 298K and total pressure 1atm. Diffusivity of N2in O2is 2*10-5m2/s. Calculate the Molar flux (mol/m2.s) of N2at a distance of 2.5cm from the top with respect to an observer moving with twice the mass average velocity a direction towards the liquid surface. (R=8.205*10-5m3atmK-1mol-1). Assume z=0 at the top of the reactor.a)4.242*10-4b)4.242*10-5c)4.242*10-3d)4.242*10-2Correct answer is option 'A'. Can you explain this answer?.
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