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A vapor pressure of toluene of 21 mm Hg, at 760 mm Hg, what is the equilibrium concentration for toluene?

A worker is exposed to toluene, methylene chloride, and turpentine vapors. if the 8 hr TWA exposures are determined by charcoal tube sampling to be 60 ppm toluene, 20 ppm methylene chloride and 20 ppm turpentine, using OSHA's PELs, has there been an overe...