Question

A 0.8M solution of ethanol has a density of 0.99 g cm3. The molality of the solution is:​

Answer 1

Molality -

Molality = Mass of solute/Mass of solution (kg)

We know, m = 1000M/1000d-Mm1

m1 = molar mass of solute

M = Molarity

d = density of solution

m = molality

therefore  we have, m =1000*0.8/1000* 0.99*-0.8*46

                           = 0.84

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