1. The problem is to find the volume $V$ given mass $m=16.34$ and density $\rho=0.66$ using the formula for volume: $$V = \frac{m}{\rho}$$ 2. This formula states that volume is equal to mass divided by density. 3. Substitute the given values into the formula: $$V = \frac{16.34}{0.66}$$ 4. Perform the division: $$V = \frac{16.34}{0.66} \approx 24.76$$ 5. Therefore, the volume is approximately $24.76$ mL. This means that if you have a mass of 16.34 units and a density of 0.66 units, the volume occupied is about 24.76 milliliters.