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April 23, 2014

Homework Help: chemistry

Posted by steve on Tuesday, October 11, 2011 at 4:46am.

An 27 liter indoor air sample is collected in a Tedlar bag in the crawl space of a building built on an old municipal dump. There is a suspicion that methylene chloride vapor may be seeping into the building. The temperature is 32K and the pressure is 767.6 millimeters of mercury. The expanded bag is returned to the laboratory for analysis and allowed to equilibrate to 25J and 760 millimeters of mercury. One milliliter of the sample is withdrawn from the bag with a gastight syringe. The mass of methylene chloride in the 1 ml aliquot is 28gg. Calculate the concentration in parts per million by volume (ppm) methylene chloride in the air sample at the time of sampling?

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