Benzene's been under a lot of pressure lately

Chemistry Level 3

\(39\text{ grams}\) 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) ?


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

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