A small amount of a non-volatile solu...

A small amount of a non-volatile solute is dissilved in `64.5 cm^(3) ` of acetone ( density `0.791 g//cm^(3) )` the vapour pressure of this solution at room temperature is 260 mm Hg , while that of acetone is 285 mm Hg . What is the molality of the solution ?

`1.51M`

`2.51M`

`1.05M`

`1.15M`

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