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Steady state evaporation

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As a result of a chemical spill, benzene is evaporating at the rate of 1 gram per minute into a room that is 6 m * 6 m * 3 m in size and has a ventilation of 10 m3/min.
a- Compute the steady state concentration of benzene in the room.
b- Assuming the air in the room is initially free of benzene, compute the time necessary for benzene to reach 95 percent of the steady-state concentration.

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The 5-page solution shows how to construct and solve the differential equation that models the situation.