Question

A condenser is used to condense substances from gaseous to liquid state, typically by cooling it. In this problem, a stream of humid air (31.6 mole% N2, 8.4 mole% O2 and water) enters a condenser in which 90% of the water vapor in the humid air is condensed and removed as liquid water. It is determined that the flow rate of this liquid water leaving the condenser as 500 cm3/hr. Given the properties for the substances as following: Water (SG 1.00 and MW 18.016), N2 (SG 0.967 and MW 28.02) and O2 (SG 1.105 and MW 32.00).


a) Draw and label a flowchart of the process.


(3 marks)


b) Calculate the total flow rate (mol/hr) of the gas stream leaving the condenser.


(6 marks)


c) Determine the average molecular weight of the mixture in the gas stream leaving the condenser.


(7 marks)


d) Determine the mass fractions of the dry air (without water) in the gas stream leaving the condenser.


(6 marks)

Answer 1

Answer:

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