Question

A solution is prepared by adding 4 g of a substance to 46 g of ethanol. What is the mass percentage of the solute?

• A. 8\%
• B. 10\%
• C. 4\%
• D. 6\%
• E. 12%

Hint:

The mass percentage of a solute is calculated by dividing the mass of the solute by the total mass of the solution, then multiplying by 100.

Answer 1

The Correct Option is A

To calculate the mass percentage of the solute, we use the formula:
\[ \text{Mass percentage of solute} = \left( \frac{\text{Mass of solute}}{\text{Mass of solution}} \right) \times 100 \] Where:
- Mass of solute = 4 g
- Mass of solvent (ethanol) = 46 g
- Mass of solution = Mass of solute + Mass of solvent = 4 g + 46 g = 50 g
Now, substituting these values:
\[ \text{Mass percentage of solute} = \left( \frac{4}{50} \right) \times 100 = 8\% \]
Thus, the correct answer is 8\% (1).