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A material balance is drawn alongside an energy balance because

  • A.the first law applies only to closed systems
  • B.the energy balance cannot be closed without production data
  • C.the auditor is required to report both under the Act
  • D.the mass flows carry the energy and must be consistent with it

Answer: D

Correct answer: the mass flows carry the energy and must be consistent with it

Energy enters and leaves a process largely inside the material streams, so the two balances share the same numbers. A mass balance that does not close means a stream has been missed or mismeasured, and the energy balance built on it will be wrong in the same place - which is why the two are drawn together and each checks the other.

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