Chemical Engineering > GATE 2020 > Unsteady State Mass Balance
A tank initially contains a gas mixture with 21 mol % oxygen and 79 mol% nitrogen. Pure nitrogen enters the tank, and a gas mixture of nitrogen and oxygen exits the tank. The molar flow rate of both the inlet and exit streams is 8 mol s-1.
In addition, use the following data and assumptions
• Assume the tank contents to be well mixed
• Assume ideal gas behavior
• The temperature and pressure inside the tank are held constant
• Molar density of the gas mixture in the tank is constant at 40 mol m-3
If the volume of the tank is 20 m3 then the time (in seconds) required for oxygen content in the tank to decrease to 1 mol % is
A
100.45
B
304.45
C
3.445
D
10

Correct : b

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Related Topics

oxygen nitrogen gas mixture chemical engineering GATE 2020 tank gas mixture molar flow rate chemical engineering oxygen content decrease ideal gas behavior well mixed tank constant temperature pressure tank volume 20 m3 gas mixture oxygen nitrogen chemical engineering calculations GATE chemical engineering 2020 molar density constant gas mixture time calculation

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