Homework 2. Due 10/01 CHE225, 20131. A two-phase mixture of water (nH2O=1 mole) and oxygen (nO2 = 2 moles) isconfined in a piston-cylinder system at P=1 bar and T=298.15 K. The mole fractionof oxygen is 0.8 in the vapor phase and 0.1 in the liquid phase.Calculate the total volume of the system. Assume all gases to be ideal. Vliq phase=18cm3/molHow many moles of water are needed to be added or remo
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Homework 2. Due 10/01 CHE225, 2013
1. A two-phase mixture of water (nH2O=1 mole) and oxygen (nO2 = 2 moles) is
confined in a piston-cylinder system at P=1 bar and T=298.15 K. The mole fraction
of oxygen is 0.8 in the vapor phase and 0.1 in the liquid phase.
Calculate the total volume of the system. Assume all gases to be ideal. Vliq phase=18
cm3/mol
How many moles of water are needed to be added or removed from the system
to convert it into a one phase system at the same pressure and temperature?
2. 1 mole of a nitrogen gas is confined at t=30 oC in a piston-cylinder system. The
piston has negligible mass and can slide inside the cylinder without friction. The
area of the piston is 100 cm2. The piston is held in place by a force F=340 kN. The
force is removed from a piston and the system is refrigerated at P=1 atm until 0.9
moles of nitrogen are condensed into a liquid phase. Calculate the volume change
of the system.
For N2: TC=126.2 K, PC=34 bar, Tn=77.3 K (normal boiling point – boiling point at
P=1 atm), VC = 89.2 cm3/mol, ZC = 0.289, ω = 0.038.
User Pitzer correlations (for the 2nd virial coefficient) for gases with P=1–10 bar.
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