What will be the mass by mass percentage of a solution containing 30 g of common salt in 220 g of water?

Options

A. 0.03
B. `1.2%`
C. `12%`
D. `22% `

Explanation

To calculate the mass by mass percentage of a solution containing 30 g of common salt in 220 g of water, follow these steps:

### Step 1: Identify the mass of solute and solvent
- **Mass of solute (common salt)** = 30 g
- **Mass of solvent (water)** = 220 g

### Step 2: Calculate the mass of the solution
- The mass of the solution is the sum of the mass of the solute and the mass of the solvent.

\[ \text{Mass of solution} = \text{Mass of solute} + \text{Mass of solvent} \]

\[ \text{Mass of solution} = 30 \, \text{g} + 220 \, \text{g} = 250 \, \text{g} \]

### Step 3: Calculate the mass by mass percentage
- The formula for mass by mass percentage is:

\[ \text{Mass by mass percentage} = \left( \frac{\text{Mass of solute}}{\text{Mass of solution}} \right) \times 100 \]

Substituting the values we calculated:

\[ \text{Mass by mass percentage} = \left( \frac{30 \, \text{g}}{250 \, \text{g}} \right) \times 100 \]

### Step 4: Perform the calculation
- Now, calculate the percentage:

\[ \text{Mass by mass percentage} = \left( \frac{30}{250} \right) \times 100 = 12\% \]

### Final Answer
The mass by mass percentage of the solution is **12%**.

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