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What is the number of phases in a system with 2 degrees of freedom and 2 components?

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What is the number of phases in a system with 2 degrees of freedom and 2 components?

(a) 1

(b) 2

(c) 3

(d) 4

This question was posed to me during an interview for a job.

My question is based upon Gibbs Phase Rule topic in chapter Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

1 Answer

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Right answer is (b) 2

The explanation is: P = 2 – 2 + 2 = 2.

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