In this chapter, some important applications of high vacuum are discussed. Pressures of 1.0 x 10-9 atm can be routinely achieved in the laboratory. CO is a common contaminant at these low levels. How many molecules of CO would be present if it was the only contaminant in a 1.0 L container at a pressure of 1.0 x 10-9 atm and 298 K?
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