JEE Main 2015Session, Shift 1ChemistryMediumSolutions71× since 2002
The vapour pressure of acetone at 20^oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in
100 g of acetone at 20^oC, its vapour pressure was 183 torr. The molar mass (g mol⁻¹) of the substance is: