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The initial condition in an unsteady state problem specifies

  • A.the flow rates that enter into the system
  • B.the stoichiometry of the reaction
  • C.the state of the system as the clock starts
  • D.the final steady state that is later reached

Answer: C

Correct answer: the state of the system as the clock starts

An unsteady state balance is a differential equation, and its solution contains a constant that only the initial condition can fix. It states what is in the system at \( t=0 \) - the 50 kilograms of salt in the earlier item, the starting temperature of a batch. The flow rates and stoichiometry appear in the equation itself, and the final steady state is an output of the solution rather than an input to it.

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