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 litres of solution

Answer

To solve the question regarding a molal solution, we will go through the definition and characteristics of molality step by step.

### 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:
\[ m = \frac{\text{Number of moles of solute}}{\text{Mass of solvent in kg}} \]

2. **Identify the Characteristics of a Molal Solution**:
- A molal solution specifically refers to a solution that contains one mole of solute.
- The mass of the solvent is crucial in determining the molality.

3. **Convert Mass of Solvent to Kilograms**:
- Since molality is expressed in terms of kilograms, we need to remember that 1 kilogram (kg) is equivalent to 1000 grams (g).
- Therefore, if we have one mole of solute, to make a molal solution, we need to dissolve it in 1 kg of solvent.

4. **Conclusion**:
- A molal solution is one that contains one mole of solute in 1000 grams of the solvent (which is equivalent to 1 kg).
- Thus, the correct answer to the question is: **1000 grams of the solvent**.

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

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