If `2` mL of acetone is present in `45` mL of its aqueous solution, calculate the concentration of this solution, .

Options

A. `4.4%`
B. `2.3%`
C. `5.1%`
D. `2.9%`

Explanation

To calculate the concentration of the aqueous solution of acetone, we will use the formula for volume percentage concentration (V/V %), which is given by:

\[ \text{Concentration (V/V %)} = \left( \frac{\text{Volume of solute}}{\text{Volume of solution}} \right) \times 100 \]

### Step-by-Step Solution:

1. **Identify the volume of the solute (acetone)**:
- Given: Volume of acetone = 2 mL

2. **Identify the total volume of the solution**:
- Given: Volume of the aqueous solution = 45 mL

3. **Use the formula for volume percentage concentration**:
- Substitute the values into the formula:
\[ \text{Concentration (V/V %)} = \left( \frac{2 \, \text{mL}}{45 \, \text{mL}} \right) \times 100 \]

4. **Calculate the fraction**:
- Calculate \( \frac{2}{45} \):
\[ \frac{2}{45} \approx 0.0444 \]

5. **Multiply by 100 to find the percentage**:
- Now, multiply by 100:
\[ 0.0444 \times 100 \approx 4.44 \]

6. **Final result**:
- The concentration of the solution is approximately **4.44%**.