Carbonyl CompoundHard

Question

The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of non-volatile substance was dissolved in 100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol−) of the substance is :

Options

A.128
B.488
C.32
D.64

Solution

According to Raoult′s law
⇒
⇒ M = 64

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