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What is the number of components in a nonreactive system of KCl-NaCl-H2O?

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in Engineering Chemistry I by (506k points)
What is the number of components in a nonreactive system of KCl-NaCl-H2O?

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in an online interview.

This intriguing question originated from Phases and Components topic in chapter Phase Rule of Engineering Chemistry I

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Right answer is (c) 3

The best I can explain: Since it is a nonreactive system, we should also take the ions into consideration (sodium ions, potassium ions, chlorine ions) and also the individual components (NaCl, KCl, H20). Hence N=6. Also E=3. Therefore the number of components are C = N-E = 6-3 = 3.

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