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Posted: 2012-06-26 10:58:00
A compressed gas cylinder of H2 containing 25 l at 200,000 kPa of pressure is emptied due a leak in a gas chromatography laboratory, with the following dimensions: 5 m long, 4 meters wide and 2.5 m height. Calculate the % oxygen and hydrogen in the atmosphere of the laboratory after the leak. If the lower explosive limit (LEL) of H2 is 4%, is there a risk of explosion? Taking into account the apparent volume of gas once expanded.
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Posted: 2012-06-22 06:38:00
10 cylinders of N2 of 25 l at 200,000 kPa are emptied due a leak in a same laboratory. Calculate the minimum concentration (%) oxygen that can be reached in the atmosphere of the laboratory after the leak. The recommended value for the concentration of O2 is > 18%. Taking into account the apparent volume of gas once expanded.
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Posted: 2012-06-23 15:59:00
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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Posted: 2012-06-26 00:29:00
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