Calculated the molality of a sulphuric acid solution in which the mole fraction of water is 0.85.

Explanation

To calculate the molality of the sulfuric acid solution in which the mole fraction of water is 0.85, we can follow these steps:

### Step 1: Understand the Definitions
- **Molality (m)** is defined as the number of moles of solute (in this case, sulfuric acid) per kilogram of solvent (water).
- The mole fraction of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution.

### Step 2: Identify Given Information
- The mole fraction of water (solvent) \(X_B = 0.85\).
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