Astream of humid air containing 2.50 mol% h2o(v) and the balance dry air is to be humidified to a water content of 10.5 mole% h2o.

for this purpose, liquid water is fed through a flowmeter and evaporated into the air stream.

the flowmeter reading, r, is 105.0.

the only available calibration data for the flowmeter are two points scribbled on a sheet of paper, indicating that readings r = 15.0 and r = 54.0correspond to flow rates= 40.0 ft3/h and= 96.9 ft3/h, respectively.

solve for the molar flow rates of humid air into and out of the process.

n1 = lb-mole/h

n2=lb-mole/h