# Benzene's been under a lot of pressure lately

Chemistry Level 2

$$39\text{ grams}$$ of pure benzene at a certain temperature is taken in a container. The vapor pressure of benzene at this temperature is $$0.850 \text{ bar}$$. To this, a non-volatile, non-electrolyte solid solute weighing $$0.5 \text{ grams}$$ is added. The vapor pressure of the solution is then $$0.845 \text{ bar}$$

What is the molecular mass of the solid substance (in grams per mole) ?

### Details

• $$\text{1 bar = 0.987 atm}$$
• $$\text{Molecular formula of benzene is } C_6H_6$$
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