Calculate the number of moles of methanol in `1` litres in its `2m` solution, if the density of the solution `0.981kgL^(-1)` (molar mass of methanol `=32g "mol"^(-1)`)

Answer

(a) When glucose is dissolved in water, the surface molecules consist of both glucose and water, therefore, escaping tendency of molecules of solvent in vapour decreases, therefore, vapour pressure decreases.
(b) `M=(% "by massxxdxx10)/("Mol wt.") rArr 6.90=(30xxdxx10)/(56)`
`rArr d=(6.90xx56)/(30xx10)=(386.4)/(300)=1.288g cm^(-3)`