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What are the total degrees of freedom if the number of species are 8, total streams are 4, stream temperature 2, stream pressure 2 and heat released 1, extent of reaction 3?

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What are the total degrees of freedom if the number of species are 8, total streams are 4, stream temperature 2, stream pressure 2 and heat released 1, extent of reaction 3?

(a) 12

(b) 16

(c) 20

(d) 24

I have been asked this question in unit test.

Asked question is from Degrees of Freedom Analysis topic in chapter Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

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Correct answer is (c) 20

The explanation: Degrees of freedom = 8 + 4 + 2 + 2 + 1 + 3 = 20.

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