Air entering the lungs ends up in tiny sacs called alveoli. It is from the alveoli that oxygen diffuses into the blood. The average radius of the alveoli is $$0.0050$$ cm and the air inside contains $$14$$ per cent oxygen. Assuming that the pressure in the alveoli is $$1.0atm$$ and the temperature is $$37oC$$, calculate the number of oxygen molecules in one of the alveoli.

Question

Infinity Learn · Accepted Answer

Volume of alveoli $$=43$$$$π$$$$R3=43$$×$$3.14$$×$$5$$×$$10$$−$$33mL=5.23$$×$$10$$−$$10mL=5.23$$×$$10$$−$$7LnO2=14100$$×nair $$=0.14$$×$$PVRT=0.14$$×$$1$$×$$5.23$$×$$10$$−$$100.0821$$×$$310=2.87$$×$$10$$−$$12$$ Molecules $$=2.87$$×$$6.02$$×$$1023$$×$$10$$−$$12$$                     $$=1.7$$×$$1012$$

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