To find the solubility of substance \( X \), we can use the information given about its saturated solution. The solubility can be expressed in grams of solute per 100 cm³ of solution.
- First, we know that in 25 cm³ of saturated solution, there are 4 g of \( X \).
- To find out how much solute would be present in 100 cm³, we can set up a proportion:
\[ \text{Solubility (g/100 cm³)} = \left( \frac{4 , \text{g}}{25 , \text{cm}^3} \right) \times 100 , \text{cm}^3 \]
- Calculating this gives:
\[ \text{Solubility} = \left( \frac{4 , \text{g}}{25} \right) \times 100 = \frac{400}{25} = 16 , \text{g/100 cm}^3 \]
Thus, the solubility of \( X \) is 16 g/100 cm³ or equivalently 16 g/L.