Questions
The vapour pressure of acetone at 20 °C is 185 Torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20 °C, its vapour pressure was 193 Torr. The molar mass of the substance is
detailed solution
Correct option is B
According to Raoult's law,
Also,
Hence,
This gives
or
Approixmate value Writing
This gives
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