1. Find values for the residual enthalpy H* for n-butane gas at 500 K and 50 bar as given by the vdW equation. Show all steps of calculation. If you use any spreadsheet please attach that with your answers. (4 Points) 2. Write the Claypeyron equation. How can this equation be used? (1 Point] 3. What is the normal boiling point? What is the vapor pressure of acetone at its normal boiling point? Show the calculation. [1 Point) 4. Write analytical correlations of residual enthalpy at low pressures (1 Point 5. Answer the following question based on the following figure (3 Points] (b) Ty. T. T100 TAKT Temperature Temperature M DI Liquids por metar fraction of ethanol Luper mar fraction of ethanol Figure A: T-xy diagrams of the ethanol-water system. Azeotropes in (a) 1.0atm and in (b) 10atm. (b) Ty TA 1 | TI 17 Temperature Temperature (0) 193 70 Liqui per molar fraction of the w L/per molar fractal Figure A: T-xy diagrams of the ethanol-water system. Azeotropes in (a) 1.0 atm and in (b) 10atm. a) At 10 atm, what is the temperature of the system when liquid phase contains 80% water b) What is the bubble point and dew point temperature when the system contains 20% ethanol at 10 atm. a) What is the liquid and vapor composition at 90C and 1 atm