Which of the following statements is true?
A. For the benzene + toluene system, the activity coefficient values for both components across all compositions will be close to 1.
B. The infinite dilution activity coefficient values for a mixture behaving according to the ideal solution must be zero.
C. The excess molar Gibbs free energy, divided by RT, is equal to the sum of the activity coefficient values, weighted by their mole fraction.
D. Another statement of the chemical equilibrium condition for mixtures in phase equilibrium says that the mixture fugacity coefficient of component i must have the same value in all of the phases that are in equilibrium.
E. None of the above are true.
A. Correct. These substances are very similar (size and intermolecular interactions), so deviations from ideal solution behavior will be minimal (? ? 1).
B. Incorrect. The natural logarithm of the infinite dilution activity coefficient must be zero, however.
C. Incorrect. It is equal to the sum of the natural logarithm of the activity coefficients, weighted by their mole fractions. See Equation 11.74 for this.
D. Incorrect. The fugacity coefficients must be weighted by their mole fractions, as shown in Equation 11.55.
E. Incorrect. One statement is true.
You might also like to view...
Orthogonal signal generation for two users. The following worksheet specifies a pair of 10-sample orthogonal data signals sAi and sBi with amplitude specified in A2. TDMA signals are computed in C6:D15, FDMA in F6:G15 with frequencies defined in F2 and G2 in units of periods per nx (=10), and CDMA in I6:J15. The orthogonality condition is computed in L17. The signal energy is computed in Row 17
a. What is the formula in C8?
b. What is the formula in C17?
c. What is the formula in F8?
d. What is the formula in F17?
e. What is the formula in G8?
f. What is the formula in I8?
g. What is the formula in I17?
h. What is the formula in L17?
Section __________ states that only qualified electrical testing labs can test, evaluate, and then list electrical products.
Fill in the blank(s) with the appropriate word(s).
Using the modified X-method of tire rotation on a front wheel drive vehicle, where should the left front wheel be placed?
A) Right rear B) Right front C) Keep it at the left front D) Left rear
A(n) ____________________, nicknamed a crash or a wreck in laypersons' terms, is damage caused by an impact (hit) on the vehicle.
Fill in the blank(s) with the appropriate word(s).