Benzene and toluene form ideal solution over the entire range of composition. The vapour pressures of pure benzene and toluene at 300 K are 50.71 mm Hg and 32.06 mm Hg respectively. Calculate the mole fraction of benzene in the vapour phase if 80 g of benzene is mixed with 100 g of toluene.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the number of moles of benzene and toluene.
1. **Molar mass of benzene (C6H6)** = 78.11 g/mol
2. **Molar mass of toluene (C7H8)** = 92.14 g/mol

Using the formula:
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