Consider two streams mixing together at a constant pressure of 1 bar (or 101325 Pa). The first stream is oxygen (O2) and has a temperature of 400 K with a mass flow rate of 2.0 kg/s. The second stream is dry air has a mass flow rate of 8.0 with a temperature of 298 K. Assume the gases are perfect.

Solve the following:

What are the mole fractions of N2 and O2 at the outlet?

What are the mass fractions of N2 and O2 at the outlet?