what is the concentration of a solution which contains 16 g of urea in 120 g of solution ?

Answer

To find the concentration of a solution that contains 16 g of urea in 120 g of solution, we will calculate the mass percent concentration using the following steps:

### Step-by-Step Solution:

1. **Identify the mass of solute and mass of solution**:
- Mass of solute (urea) = 16 g
- Mass of solution = 120 g

2. **Use the formula for mass percent concentration**:
The formula for mass percent concentration (w/w%) is:
\[ \text{Mass percent} = \left( \frac{\text{Mass of solute}}{\text{Mass of solution}} \right) \times 100 \]

3. **Substitute the values into the formula**:
\[ \text{Mass percent} = \left( \frac{16 \, \text{g}}{120 \, \text{g}} \right) \times 100 \]

4. **Calculate the fraction**:
\[ \frac{16}{120} = 0.1333 \]

5. **Multiply by 100 to get the percentage**:
\[ 0.1333 \times 100 = 13.33\% \]

6. **Convert to decimal form if required**:
If you want the concentration in decimal form, divide the percentage by 100:
\[ 13.33\% = 0.1333 \]

### Final Answer:
The concentration of the solution is **0.1333** (or **13.33%** if expressed as a percentage).