Verify concepts of phase equilibrium and phase transitions using the steam tables. a. Establish by direct calculation this equality between molar Gibbs free energies for steam at 2.5 MPa and 224oC : Gl = Gv
b. Calculate Gv at 2.5 MPa for temperatures between 225 and 400oC and extrapolate this curve below 224 oC.
c. Find Gl at 160, 170, 180, 190, 200, and 210 oC. Plot in the same graph used for part b and extrapolate above 224 oC. Hint: for a liquid, H and S can be taken as independent of P.
d. Plot the molar volume V vs. T at P =2.5 MPa over the T range between 150 and 400 oC, and show that V is discontinuous.
e. Plot Cp vs. T at P =2.5 MPa over the T range between 150 and 400 oC, and show that Cp is discontinuous.
f. Using the data in the steam tables, show that the Gibbs energies per unit mass of steam and liquid water in equilibrium at 300 oC are equal.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?