# Chapter 2 Atoms, Molecules, and Ions - 2-9 Atoms, Molecules, and the Mole - Review & Check for Section 2-9 - Page 84: 5

A

#### Work Step by Step

Molar mass of $O_2: 31.998\ g/mol$, Avogadro's number: $6.022\times10^{23}\ molecules/mol$ In 16 g of $O_2$: $16\ g\div31.998\ g/mol\times6.022\times10^{23}\ molecules/mol=3.011\times10^{23} molecules$ 2 atoms of O/molecule of $O_2$ $6.022\times10^{23}\ atoms$ of O.

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