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What are the number of variables associated with a process stream, if the number of species in the stream are 5?

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What are the number of variables associated with a process stream, if the number of species in the stream are 5?

(a) 1

(b) 3

(c) 5

(d) 7

The question was posed to me in quiz.

This key question is from Solving Material and Energy Balances Using Process Simulators in chapter Humidity Charts & their Use, Analysis of the Degrees of Freedom in a Steady – State Process, Solving Material and Energy Balances Using Process and Unsteady State Material and Energy Balances of Basic Chemical Engineering

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Best answer
The correct choice is (d) 7

Easiest explanation: Nv = Nsp + 2 = 5 + 2 = 7.

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