Last updated 2/11/09

This page is periodically updated as new errors are found. The date that the error
was recorded is listed at the end of each line.

- problem 1.8, several places the molar volumes are
calculated and the units are cm
^{3}and should be cm^{3}/mol. Also, for part (e), the steam tables should have been used for V rather than the ideal gas law. (1/31/08) - problem 1.16, multiply the final answer for
__U__by 2. (2/22/01) - problem 2.8, part (a) and (b), the extensive H value needs to be underlined. (2/22/01)
- problem 2.5, part (c), second line, replace Q with W.(2/7/05)
- problem 2.10, Numbers for DeltaV are inserted backwards. Change sign on value of W. Change sign on value for W in calculation of Q. The correct value for Q is (given value)*1.913. (3/31/06)
- problem 2.22, in the final number for U
^{out}the middle two numbers are transposed. (2/22/01) - problem 2.28, incorrect equations used, corrected solution will be sent to verifiable instructors upon request.(9/22/99)
- problem
3.4, the calculation of (nT)
^{i}used 2 m^{3}instead of 2.5 m^{3}. Multiply given (nT)^{i}by 1.25. This changes the subsequent calculations. To check your final calculations, multiply the given nDU and the given kg TNT by 1.59. - problem 3.5, the masses of vapor and liquid are too big by a factor of 2, also the energies and work should be in kJ instead of J. Therefore multiply the given kg of TNT by 500 to obtain the correct answer.(9/22/99)
- problem 3.23 (b) the subscripts should be for state 3, third line should read
H3' = 2
39.7 + ... , also 6.8179 should be 6.1876 twice. This changes DH' and W. (also see errata for 3.23(c) below). (2/7/05)**8** - problem
3.23 (c) the saturation enthalpy should be 720.8. After correcting subsequent
calcs, the correct
__Q__is 3.745*(given__Q__). (also see entry for 3.23(b) above).(9/24/00) - problem 3.27 (c) for calculation of Q2, replace 1080 with 1105 which changes the value of Q2.(9/27/01)
- problem 4.2 (iii), for the second turbine, the wrong efficiency is used. With the correct efficiency, for each of the following variables, multiply the answer in the printed solution by the correction factor, {ΔH, 1.125}; {H6, 0.9665}; {x6', 0.907}; {S6, 0.9667}; {QL, 0.9640}; {flowrate, 0.927}; {Total QH, 0.927}; {thermal efficiency, 1.097}. (2/19/04)
- problem 4.4 part (i) H8 is slightly larger than the value in the current steam tables; (i) and (ii), the label in the lower left of each table under Boiler: 'H3' should be 'H1'. (2/11/09)
- problem 4.07, In the E-balance for Preheater B, replace m
_{3}H_{13}with (m_{2}+ m_{3})H_{13}, for the E-balance on Preheater C, m_{4}H_{15}with (m_{4}+ m_{14})H_{15}or ( m_{2}+ m_{3}+ m_{4})H_{15}, for the condenser, replace m_{4}H_{15}with ( m_{2}+ m_{3}+ m_{4})H_{15}. These errors affect some of the flowrates slightly. - problem 4.13, Some of the values for the intermediate pressure are at 0.5 MPa instead of 0.29 MPa. After correcting, the works for the compressors are 23 and 35 kJ/kg. For the economizer, q=0.28. (2/19/02)
- problem 4.14, In the table, H6 should be 256.4. Also part (c) is worked using the quality into the condenser instead of the quality into the economizer. The quality into the economizer should be 23% which changes m6 and m7. This changes some values in part (d), but doesn't end up changing the value of H4. (2/21/01)
- problem 4.18. The work should be calculated based on U, not H. The efficiency should be 0.02 higher than the reported value. (7/18/08).
- problem 5.1 (e), The final answer is for (dT/dH)s, not for (dH/dT)s, so the final equals sign should be removed. Also, the final answer should be divided by V rather than multiplied by V. (2/20/02)
- problem 5.6 (d), for CS2, the
first two data columns should be MW=76.14 and rho=1.258 g/cm
^{3}so the calculations are incorrect. The other data in that row are fine. (2/20/02) - problem 6.2, (ii) the problem was incorrectly solved for a final state 0.9 MPa instead of 0.9 bar. (3/3/00)
- problem 6.10, (a) the equation for da/dT should have a minus sign on the right hand side. (9/27/99)
- problem 6.22, numerator on right-hand side of answer, replace 4b with 4br, and in exp function replace R with k. (3/13/02)
- problem 7.05, last two lines, first term on right-hand side of answer for each line, for the denominator, replace R with Rb. (3/13/02)
- problem 7.31, in the derivative (dP/dV)
_{T}replace "-R" with "-RT". (10/04/01) - problem 8.03, (a) the solution incorrectly uses the area under the curve rather than the area to the left of the curve. The final number is virtually the same. (2/24/03).
- problem 8.16, (c) multiply the given number by 1.04 [from part (a)] to put on a basis of cycle 1 flow. (2/22/01)
- problem 9.11, The solution uses the wrong Antoine coefficients for toluene. For part(a) the approximate answer for emission of toluene is 1.25*(given answer), for (b) 1.11*(given answer), for (c) 1.11*(given answer). This error changes slightly the values for hexane. For (d) the
__V__used in the solution is 500L and should have been 200L, multiply the answer by 2/5.(3/20/08). - problem 11.08(a), lnj
_{i}= 0.987 for each component.(3/13/02) - problem 11.11, Psat for (2) is about 111.8 mmHg which changes the numbers slightly. (2/22/01)
- problem 11.18, equation
for γ
_{2}, the value 0.62 should be 0.64 which changes the subsequent values slightly. (7/9/04) - problem 10.11, on the plot, the ordinate label should be "mole fraction of biphenyl". (4/17/01)
- problem 10.39, first and second line, Helmholtz energy should be underlined, second line, replace '6' with '4'. (11/16/04).
- problem 12.3, (b) using the current UNIFAC LLE, part (a) is very similar, but part (b) gives Kd ~1.75*(given value) at 25C and Kd~1.52*(given value) at 37C. (2/21/01)
- problem 12.10, (a),
the value for x
_{b}should be 1.6E-4, the final value is γ_{b}= 6.248E-3*(given value). - problem 14.05, (a) replace "ml" with "mol"; (b) in the expression for Ka, replace (1-x) with (0.5 - x), other values are OK. This part of the problem is worked for a feed basis of 0.5 mol C3H8 and 0.5 mol N2. (4/25/01)
- problem 14.06, (b), (100-x) was omitted in the expression for Ka; multiply the given answer for x by 0.13973. Use a factor of 0.14495 for the shortcut result.(5/4/00)
- problem 14.07, the sign on ΔH is incorrect twice, but ΔH is used correctly in the shortcut van't Hoff calculation. (4/28/03)
- problem 14.09, (b), for the inlet, the table headings use "out" and should read "in" (4/17/00)
- problem 14.14, for CO n
^{f}, delete the 3. For OBJ1, both lines, multiply first term by P^{2}. For OBJ1 second line, delete the 3. For OBJ2 second line, delete the 3. The subsequent table is OK.(9/24/00)

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*Copyright © 2004, Carl T. Lira, J. Richard Elliott. All rights reserved.*