Degree$-$of$-$Freedom Analysis: Example $1.$

A stream of humid air enters a condenser in which $95\%$ of the water vapor in the air is condensed. The flow rate of the condensate $($the liquid leaving the condenser$)$ is measured and found to be $225\frac{L}{h}.$ Dry air may be taken to contain $21$ mole$\%$ oxygen, with the balance nitrogen. Calculate the flow rate of the gas stream leaving the condenser and the mole fractions of oxygen, nitrogen, and water in this stream.