How should I determine the total number of phases that are at equilibrium with each other in a multi-component mixture?
For example, this problem is from the 2007 GRE published by ETS (Problem 24):
What is the maximum number of phases that can be at equilibrium with each other in a three component mixture?
I initially thought the answer should be 3 since no matter what kind of mixture it is there should always be solid, liquid, and gas. But then I understood that there can be situations like immiscible liquids which increases the total number of phases. The actual answer is 5. What does this number entail?