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A laboratory hood has ventilation face velocity of 110 ft/min traveling through the opening which is 70 inches wide and 15 inches high. Acetone at

A laboratory hood has ventilation face velocity of 110 ft/min traveling through the opening which is 70 inches wide and 15 inches high. Acetone at 23C is spilled on the bench top inside the hood. The area of the spill is 70 inches by 24 inches. Assuming the hood has excellent mixing (k = 0.5) what is the concentration of acetone in the hood in ppm

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