0.324 g of copper was dissolved in nitric acid and the copper nitrate so produced was burnt till all copper nitrate converted to `0.406` g of copper oxide. Calculate the equivalent weight of copper.

Explanation

To solve the problem of calculating the equivalent weight of copper, we will follow these steps:

### Step 1: Write the reactions involved
The first reaction involves copper reacting with nitric acid to form copper nitrate. The second reaction involves the thermal decomposition of copper nitrate to form copper oxide.

1. **Reaction 1**:
\[
\text{Cu} + 2 \text{HNO}_3 \rightarrow \text{Cu(NO}_3\text{)}_2 + \text{H}_2\text{O} + \text{NO}_2
...