If a sealed box at STP holds a total of 6.7 moles of clean air, how many oxygen molecules does it contain?

Name: If a sealed box at STP holds a total of 6.7 moles of clean air, how many oxygen molecules does it contain?
Brand: Quizplus
Rating: 4.9 (44 reviews)

Question

Quizplus · Accepted Answer

Clean air is approximately 21% oxygen. Therefore, 6.7 moles of air contains about 1.407 moles of oxygen. Multiplying by Avogadro's number (6.02 × 10^23 molecules/mole) gives approximately 8.4 × 10^23 oxygen molecules.

If a Sealed Box at STP Holds a Total of 6.7