To prepare a 3% solution, how many grams of solute are needed in 100 mL of solution?

To determine how many grams of solute are needed to prepare a 3% solution in 100 mL of solution, it is essential to understand what a 3% solution means. A 3% solution indicates that there are 3 grams of solute for every 100 mL of solution.

In this situation, since the question specifies a volume of 100 mL, we can directly apply this definition. For a 3% solution, the calculation is straightforward: 3 grams of the solute must be dissolved in enough solvent (usually water) to make the total volume reach 100 mL.

Thus, selecting the correct answer of 3 grams aligns perfectly with the definition of what a 3% solution entails. Therefore, you need 3 grams of the solute to make a total volume of 100 mL of a 3% solution.