Molar mass

Chemistry Level 2

The vapour pressure of acetone at \({20}^\circ\)\(C\) is \(185\) torr. When \(1.2\) \(g\) of a non-volatile substance was dissolved in \(100\) \(g\) of acetone at \({20}^\circ\)\(C,\) its vapour pressure was \(183\) torr. What is the molar mass \((g\) \(mo1^{-1})\) of the substance \(?\)


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