The vapour pressure of acetone at \( 20^{\circ} \mathrm{C} \) is 185 torr. When \( 1.2 \mathrm{~...

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The vapour pressure of acetone at \( 20^{\circ} \mathrm{C} \) is 185 torr. When \( 1.2 \mathrm{~g} \) of non-volatile substance was dissolved in \( 100 \mathrm{~g} \) of acetone at \( 20^{\circ} \mathrm{C} \), its vapour pressure was 183 torr. The molar mass \( \left(\mathrm{g} \mathrm{mol}^{-1}\right) \) of the substance is
(a) 128
(b) 448
(c) 32
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