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“Chemical reactions or phase changes occur” is this statement applicable for unsteady state energy balance?

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in Bioprocess Engineering by (80.7k points)
“Chemical reactions or phase changes occur” is this statement applicable for unsteady state energy balance?

(a) True

(b) False

I have been asked this question in an international level competition.

This interesting question is from Solving Unsteady topic in portion Unsteady – State Material and Energy Balances of Bioprocess Engineering

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Right choice is (b) False

To explain I would say: No chemical reactions or phase changes occur as the system is well mixed with uniform temperature and composition. Properties of the outlet stream are therefore the same as within the system and mixtures and solutions are ideal.

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