**Question:** How many atoms
of oxygen are there in one mole of carbon dioxide?

**Answer**:

The number of molecules is equal to 6.02
x 10^{23}, which is true for one mole of any substance. To
figure out the

number of atoms, you need to multiply
the number of molecules by the number of atoms of oxygen per molecule of
carbon dioxide. Since there are two atoms per CO_{2}, simply
multiply by 2 to get 1.204 x 10^{24}.

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