Calculate the mass of a non-volatile solute ( molecular mass `40`) which should be dissolved in `114 g` octane to reduce its vapour pressure to `80%`.

Explanation

To solve the problem of calculating the mass of a non-volatile solute needed to reduce the vapor pressure of octane to 80%, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Given Information:**
- Molecular mass of the solute (M_solute) = 40 g/mol
- Mass of octane (m_octane) = 114 g
- Vapor pressure of the solution (P) = 80% of the vapor pressure of pure octane (P₀).
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