CHE 421

Thermodynamics

Fall 2003

Homework Assignments (as of October 8, 2003)

Chap 1: 7 (176.80 kPa), 13 (m = 113.5 lbm), 14 ($43.80/yr), 19 (0.487 kg/s), 20

Chap 2: 5 (U23 = -4000), 11 (55.7 min), 23 (43.32 C), 27 (include both kinetic energy and enthalpy; 578.9 R), 29 (D = 1.49 cm), 36 (W = -172.89 kJ)

Chap 3: 4 (W = 516 kJ), 8 (W = 0 (a); -10.37kJ (b); -5.59 kJ(c)), 19 (T = 600K (a); 209K (b); 442.7K(c)), 32 (Z = 0.929; 0.932; 0.928; 0.928; 0.920), For these next three problems, compare various methods with "exact" values found in Perry's: 38 (a), 39 (a), 40 (a) (Liquid volume in cm^3/mole = 94.3 from reduced density chart, 92.2 from P/R EOS, 95 from Z graph), 47 (79.8 bar from L/K), 51 (401.6 bar from L/K)

Chap 4: 11 (Do chloroform only; eq 4.12 gives 0.32% error), 14 (a) (Q = 1.372 e06 W), 18 (The difference between the two heats of combustion is the same as the heat of reaction for the methanol.), 19 (For part e, T = 2283K), 21 (a), 23 (a) (Find the heat of reaction at 600C: Delta H = -109795 J/mole), 29 (Heat lost in furnace = -70590 J/mole; Heat lost in heat exchanger = -766,660 J/mole; NOTE: Make certain to check whether or not any water condenses in the exchanger!) , 32 (Q = 54,880 J/mole)

Chap 5: 2 (Power = 149 kW), 7 (Power = 5.34e06 kW), 26 (Delta S total = 6.02 J/K) , 30 (Delta S total = 3.42 J/K)

Chap 6: 5, 10 (P = 205 bar), 14 (a) (HR = -2302 J/mole), 15 (HR = -2595 J/mole), 16 (HR = -2655 J/mole), 21 (Delta H = 377 BTU/lb), 53 (H liq = -7687 J/mole), 86 (3.0 cm), 87 (a) (VR = -192.38 cm^3/mole), 88 (a) (HR = -6920.46 J/mole)

Chap 10: 3(y = 0.915), 6 , 9 (a) (V = 0.834), 17 (azeotrope occurs at x = y = 0.857, P = 81.37 kPa), 27 (V = 0.844), 34 (P = 330 psia)

Chap 11: 13(V1 = 120, V2 = 70, V1barinf = 128, V2barinf = 85. Write the results for Vibar in terms of x1: V2bar = 70+x^2+14x^3), 16 (Using the Z values, at P = 60 bar, f = 55.3 bar; at P = 500 bar, f = 318 bar), 21 (f/fsat = 1.079), 25 (For the mixture, f1barhat = 10.053, f2barhat = 17.059), 32 (a = 3448; V2barE = (a-b)x^2+2(b-c)x^3+3cx^4), 37(a) (V = 1.569e04 cm^3/mole, GR = -101.75 J/mole)

Chap 12: 1 (Parts a, d) (a, A12 = 0.683, A21 = 0.475; with Barker's method, A12 = 0.758, A21 = 0.435), 6 (A12 = -0.337, A21 = -0.535, C = 0.193; Barker's method: A12 = -0.364, A21 = -0.521, C = 0.227), 12 (acetone - water), 18 (acetone - water)(a. Tbub = 62.58C; b, Tdew = 90.61C; c. V = 0.448), 27 (V = 2243 cm^3), 38 (-63.72 kJ), 46 (20900 BTU/s)

Chap 13: 4 (epsilon = 0.453), 6, 17 (water-free, ethylene = H2 = 0.455), 20 (1 bar, 300K, epsilon = 0.966; part d, T = 584.5K), 23 (T = 624K), 31 (xA = 0.395 for non-ideal)