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

Options

A. `1000g` of the solution
B. `1000 c.c` of the solution
C. `1000 c.c` of the solvent
D. `1000g` of the solvent

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.

### Step-by-Step Solution:

1. **Understanding Molality**:
- Molality (m) is defined as the number of moles of solute per kilogram of solvent.
- The formula for molality is given by:
\[ m = \frac{\text{moles of solute}}{\text{mass of solvent in kg}} \]

2. **Identifying the Components**:
- In the question, we are looking for the correct amount of solvent that corresponds to one mole of solute.
- We need to find out how many grams of solvent correspond to 1 kg.

3. **Conversion of Kilograms to Grams**:
- 1 kilogram (kg) is equal to 1000 grams (g).
- Therefore, when we say 1 kg of solvent, it is equivalent to 1000 g of solvent.

4. **Applying the Definition**:
- According to the definition of molality, if we have 1 mole of solute, it must be dissolved in 1 kg (or 1000 g) of solvent to create a molal solution.

5. **Selecting the Correct Option**:
- From the options provided:
- Option A: 1000 gm of the solution
- Option B: 1000 cc of solution
- Option C: 1000 cc of solvent
- Option D: 1000 gm of solvent
- The correct answer is **Option D: 1000 gm of solvent**, as it aligns with the definition of molality.

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

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