We know that copper is a conductor of electricity due to presence of free electrons in it. Assume that on an average each copper atom provides one free electron. Find the number of free electrons per unit valume of copper. The density of copper is approximately 9,000 kg /`m^3` and its atomic mass is 63.5 u.

Explanation

To find the number of free electrons per unit volume of copper, we can follow these steps:

### Step 1: Calculate the molar mass of copper in kg
The atomic mass of copper is given as 63.5 u (unified atomic mass units). To convert this to kilograms, we use the conversion factor:
1 u = 1.66 x 10^-27 kg.

\[
\text{Molar mass of copper (in kg)} = 63.5 \, \text{u} \times 1.66 \times 10^{-27} \, \text{kg/u} = 1.055 \times 10^{-25} \, \text{kg}
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