Some solved examples of the mole are given below, which can help you understand it more easily.

**Example 1.**

Determine the number of moles in 10 grams of carbon.

**Solution**

**Step 1. **The mass of carbon is given. i.e.

Mass of carbon = 10 g

**Step 2. **Look at the periodic table.

Molar mass of carbon = 12.011 g/mol

**Step 3.** Write down the formula of the mole

Mole = Mass / Molar mass

Substitute these values in the formula of mole. i.e.

Mole of carbon = 10 / 12.011 = 0.832 mol

Approximately 0.832 moles are in 10 grams of Carbon.

**Example 2.**

Calculate the mass of 0.8 moles of Hydrogen gas.

**Solution**

**Step 1.** Here,

A mole of Hydrogen gas (H_{2}) = 0.8 mol

**Step 2. **Molar mass of H_{2} = (2 × 1.0078) g/mol = 2.0156 g/mol

**Step 3.** We have the following equation to find the mass of hydrogen gas.

Mass = Moles × Molecular weight

Put the above values in the formula of mass. i.e.

Mass = 0.8 × 2.0156 = 1.6124 grams

The mass of 0.8 moles of hydrogen gas is 1.6124 grams.