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    In an organic chemistry laboratory, during a practical work, from 9 to 13 h, has shown that there is a consumption of about 3 litres of 2-butanone (methylethylketone). Since there is a waste management program and the presence of this product is not detected, it is assumed that consumption of this amount is due to evaporation. Calculate the flow rate of ventilation required to maintain the 2-butanone concentration in air below the OEL value (200 ppm) during the practical work. The laboratory ha

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