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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 $20^{\circ}$its vapour pressure was $183$ torr. The molar mass $(g mol^{-1}) of the substance is :

$\begin{array}{1 1} 128 \\488 \\ 32 \\ 64 \end{array} $

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64
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