Discussion
Consider the following statements about the NRTL model.
1. It contains a non-randomness parameter as well as interaction parameters.
2. It can describe partially miscible liquid systems.
3. It requires no experimental data to use.
Answer: B
The first two are correct and are why it is widely used for aqueous organic systems. The third is wrong, since its parameters are regressed from binary equilibrium data. No activity coefficient model is genuinely predictive.
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