What is the total pressure of contained if it contains 0.3 fraction of N2 with partial pressure 8 Pa, 0.3 fraction of H2 with partial pressure 2 Pa, 0.4 fraction of CO2 with partial pressure 15 Pa?

Correct Answer:
Total pressure = 0.3*8 + 0.3*2 + 0.4*15 = 9 Pa.