What is the mass of 7.9⋅1023 of O2 at STP?

1 Answer
anor277
Jan 30, 2016

The mass of 7.9×1023 O2 molecules is INDEPENDENT of temperature and pressure. It is approx. 40 g.

Explanation:

Avogadro's number of O2 molecules has a mass of 32.00 g.

We have 7.9×1023 O2 particles; i.e.

7.9×1023 particles6.022×1023 particles mol−1 =1.31 mol.

So we take this molar quantity, and multiply this by the molecular weight:

1.31⋅mol×32.00⋅g⋅mol−1 = ???g

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