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Chemistry · 2015
JEE Main 2015 · 2015-04-04 Offline · Q36
The vapour pressure of acetone at 20°C is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20°C, its vapour…
The vapour pressure of acetone at $\displaystyle 20$°C is $\displaystyle 185$ torr. When $\displaystyle 1.2$ g of a non-volatile substance was dissolved in $\displaystyle 100$ g of acetone at $\displaystyle 20$°C, its vapour pressure was $\displaystyle 183$ torr. The molar mass ( $\displaystyle \mathrm{g} \mathrm{mol}^{-1}$ ) of the substance is :
Official answer
(2)
$\displaystyle 64$
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JEE Main 2015 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.