Discussion
Arrange the following steps of a bubble point calculation in the usual order.
1. compute the partial pressures and their sum
2. assume a temperature at the given pressure and liquid composition
3. adjust the temperature until the sum matches the system pressure
4. evaluate activity coefficients at that composition and temperature
Answer: A
The calculation is iterative because the activity coefficients depend on the temperature being sought. Recognising which quantities are known at the outset is what makes the loop converge quickly. A poor initial guess merely costs a few more iterations.
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