Problem
1. A 2-kg mixture of 25% N2, 50% O2, and 25% CO2 by mass is at 150 kPa and 300 K. Find the mixture gas constant and the total volume.
2. A diesel engine sprays fuel (assume n-dodecane, C12H26, M = 170.34 kg/kmol) into the combustion chamber already filled with 1 mol fuel per 88 mol air. Find the fuel fraction on a mass basis and the fuel mass for a chamber that is 0.5 L at 800 K and has a total pressure of 4000 kPa.
3. A new refrigerant, R-410a, is a mixture of R-32 and R-125 in a 1:1 mass ratio. What are the overall molecular weight, the gas constant, and the ratio of specific heats for such a mixture?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.