15 g of methyl alcohol is dissolved in 35 g of water. The mass percentage of methyl alcohol in solution is:

Options

A. `35%`
B. `30%`
C. `45%`
D. `40%`

Explanation

To find the mass percentage of methyl alcohol in the solution, we can follow these steps:

**Step 1: Identify the mass of the solute and the solvent.**
- The mass of methyl alcohol (solute) = 15 g
- The mass of water (solvent) = 35 g

**Step 2: Calculate the total mass of the solution.**
- Total mass of the solution = mass of solute + mass of solvent
- Total mass of the solution = 15 g + 35 g = 50 g

**Step 3: Use the formula for mass percentage.**
- The formula for mass percentage is:
\[ \text{Mass Percentage} = \left( \frac{\text{Mass of solute}}{\text{Total mass of solution}} \right) \times 100 \]

**Step 4: Substitute the values into the formula.**
- Mass Percentage of methyl alcohol =
\[ \left( \frac{15 \text{ g}}{50 \text{ g}} \right) \times 100 \]

**Step 5: Calculate the mass percentage.**
- Mass Percentage of methyl alcohol =
\[ \left( \frac{15}{50} \right) \times 100 = 30\% \]

Thus, the mass percentage of methyl alcohol in the solution is **30%**.

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