Calculate mass of `CO_(2)` produced byheating 40g of `20%` pure lime stone.

Explanation

To calculate the mass of CO₂ produced by heating 40 g of 20% pure limestone, we can follow these steps:

### Step-by-Step Solution:

1. **Determine the mass of pure limestone (calcium carbonate)**:
- Given that the limestone is 20% pure, we can calculate the mass of pure calcium carbonate (CaCO₃) in the 40 g sample.
\[
\text{Mass of CaCO}_3 = 40 \, \text{g} \times \frac{20}{100} = 8 \, \text{g}
...