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There is a liquid in a cylinder containing approximately 1 pound Ethylene. The liquefaction occurs in a room that measures 25ft wide by 75ft long

There is a liquid in a cylinder containing approximately 1 pound Ethylene. The liquefaction occurs in a room that measures 25ft wide by 75ft long and 9ft high. Assume that ethylene has a density of 0.0786 lbs/ft3 at room temperature and pressure. What is the concentration in ppm? (Assume uniform mixes and no loss)

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