**1.**

1 doz = 12

1 penny = 3.00x10^{22} copper atoms

$\mathbf{1}\mathbf{}\overline{)\mathbf{penny}}\mathbf{\times}\frac{\mathbf{3}\mathbf{.}\mathbf{00}\mathbf{\times}{\mathbf{10}}^{\mathbf{22}}\mathbf{}\overline{)\mathbf{copper}\mathbf{}\mathbf{atoms}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{penny}}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{dozen}}{\mathbf{12}\mathbf{}\overline{)\mathbf{copper}\mathbf{}\mathbf{atoms}}}$** = 2.5x10 ^{21} dozens**

There are **2.5x10 ^{21} dozens** of copper atoms in a penny.

**2.**

1 gross = 144

1 penny = 3.00x10^{22} copper atoms

$\mathbf{1}\mathbf{}\overline{)\mathbf{penny}}\mathbf{\times}\frac{\mathbf{3}\mathbf{.}\mathbf{00}\mathbf{\times}{\mathbf{10}}^{\mathbf{22}}\mathbf{}\overline{)\mathbf{copper}\mathbf{}\mathbf{atoms}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{penny}}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\mathbf{gross}}{\mathbf{144}\mathbf{}\overline{)\mathbf{copper}\mathbf{}\mathbf{atoms}}}$** = 2.08x10 ^{20} gross**

There are **2.08x10 ^{20} gross** of copper atoms in a penny.

**3. **

Pure copper penny contains approximately 3.00x10^{22} copper atoms.

1 doz = 12

1 gross = 144

1 ream = 500

1 = 6.022x10^{23}

Use these definitions to determine the following:

1. How many dozens of copper atoms are in a penny.

2. How many gross of copper atoms are in a penny.

3. How many reams of copper atoms are in a penny.

4. How many moles of copper atoms are in a penny.

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