To calculate the density of the unknown substance, you can use the formula for density:
\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \]
Given:
- Mass = 4725 grams
- Volume = 350 cm³
Now, substituting the values into the formula:
\[ \text{Density} = \frac{4725 \text{ g}}{350 \text{ cm}^3} \]
Calculating this gives:
\[ \text{Density} = 13.5 \text{ g/cm}^3 \]
Now, let's compare this density to the typical densities of the substances listed:
- Mercury: Approximately 13.6 g/cm³
- Iron: Approximately 7.9 g/cm³
- Lead: Approximately 11.3 g/cm³
- Gold: Approximately 19.3 g/cm³
Based on the calculated density of 13.5 g/cm³, the closest match is Mercury.
Thus, the unknown substance identified is Mercury.