My dear, that comes to approximately 3.01 x 10^23 molecules. I know this because I check the calibration of our gas analyzers every week. Just last Thursday, I was verifying a CO2 flow for a lab procedure, and the neatness of that number—one half of Avogadro's constant for 22 grams—made me smile, same as when my granddaughter gets a math sum perfectly right.
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