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Gibbs phase rule defines the relationship between degrees of freedom (F) of a system, number of phases (P) and the number of components (c). What is the equation?


1. F + P = C
2. F + P = C + 1
3. F – P = C
4. F + P = C + 2

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Correct Answer - Option 4 : F + P = C + 2

Concept:

Gibbs phase Rule

P + F = C + Non-compositional variable

If numbers of Non-compositional variable is given then we should put that number, otherwise it is 2

i.e.

P + F = C + 2

P = No. of phases, F = Degrees of freedom, C = No. of components

 

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