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The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g is added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution, then, is 0.845 bar. The molar mass of the solid substance is-
1. 150 g mol–1
2. 180 g mol–1
3. 170 g mol–1
4. 160 g mol–1
Other Reason
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