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Find the Number of Ozone Molecules in the Stratosphere

Ozone molecules in the stratosphere absorb much of the harmful radiation from the sun. the temp. and the pressure of ozone in the stratosphere are 250 K and 1.0*10^-3 atm. How many ozone molecules are present in 1.0 L of air under these conditions?

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The ideal gas law is,

PV = n RT

where R = 0.0821 L atm/mol K and n is the number
of ...

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