Problem: Part AIf the pressure exerted by ozone, O3. In the stratosphere is 3.0 x 10-3 atm and the temperature is 251 K, how many ozone molecules are in a liter? Express your answer using two significant figures. 

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Part A

If the pressure exerted by ozone, O3. In the stratosphere is 3.0 x 10-3 atm and the temperature is 251 K, how many ozone molecules are in a liter? 

Express your answer using two significant figures.