Answer the following statement(s) true (T) or false (F)

A. The cross-parameter for “b” (b12) is calculated using a geometric mean combining rule.
B. The cross-parameter for “a” (a12) is calculated using an arithmetic mean combining rule.
C. The mixture parameters can be calculated exclusively from the pure component parameters.
D. The binary interaction parameter is normally used to modify the cross-parameter for b.
E. None of the above are true.


A. Incorrect. This cross parameter is calculated by the arithmetic mean. See Equation 11.126.
B. Incorrect. This cross parameter is calculated by the geometric mean. See Equation 11.125.
C. Incorrect. Equations 11.123 and 11.124 show that the compositions are part of the definitions of the mixture parameters for the equation of state.
D. Incorrect. The k12 variable is used to modify the cross parameter for a, not b.
E. Correct. Each is false.

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