A molal solution is one that contains one mole of a solute in

Options

A. 1000 g of the solvent
B. one litre of solvent
C. one litre of solution
D. 22.4 litre of the solution

Explanation

To solve the question, "A molal solution is one that contains one mole of a solute in...", we need to understand the definition of molality and how it relates to the amount of solute and solvent.

### Step-by-Step Solution:

1. **Understand the Definition of Molality**:
- Molality (m) is defined as the number of moles of solute per kilogram of solvent.
- The formula for molality is:
\[ \text{Molality (m)} = \frac{\text{Number of moles of solute}}{\text{Mass of solvent (kg)}} \]

2. **Identify the Given Information**:
- The question states that we are looking for a molal solution that contains one mole of solute.
- Therefore, we can set the number of moles of solute to 1.

3. **Set Up the Equation**:
- Since we are looking for a molal solution with one mole of solute, we can write:
\[ 1 \text{ molal} = \frac{1 \text{ mole of solute}}{\text{Mass of solvent (kg)}} \]

4. **Solve for Mass of Solvent**:
- Rearranging the equation gives us:
\[ \text{Mass of solvent (kg)} = \frac{1 \text{ mole of solute}}{1 \text{ molal}} = 1 \text{ kg} \]
- Converting kilograms to grams:
\[ 1 \text{ kg} = 1000 \text{ grams} \]

5. **Conclusion**:
- Therefore, a molal solution is one that contains one mole of a solute in **1000 grams of solvent**.

### Final Answer:
A molal solution is one that contains one mole of a solute in **1000 grams of solvent**.