How many ozone molecules in 1.0L of air under these conditions?

Typically, the temperature and pressure of ozone in the stratosphere are 250 K and 1.0 * 10^-3 atm, respectively. How many ozone molecules in 1.0L of air under these conditions?

Use the ideal gas law:

PV=nRT
(1.0×10^-3 atm)(1.0 L)=n(0.08206 L-atm/mol-K)(250 K)
n = 4.9 x 10^-5 mol.

Then, multiply by Avogadro’s number:

(4.9 x 10^-5 mol)(6.022 x 10^23) = 2.9 x 10^19 molecules

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