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What are the number of equations associated with 3 process stream, if the number of species in the stream are 2?

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What are the number of equations associated with 3 process stream, if the number of species in the stream are 2?

(a) 3

(b) 4

(c) 6

(d) 12

The question was posed to me during an interview.

My question is taken from Solving Material and Energy Balances Using Process Simulators topic in section 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) 12

Easy explanation: Number of equations = 3(2 + 2) = 12.

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