# 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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