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Homework Statement
:[/B]The density of a 2.05 molar solution of acetic acid is 1.02g/ml. The Molality of the solution is:
(a) 1.14 mole/kg
(b) 3.28 mole/kg
(c) 2.28 mole/g
(d) 0.44 mole/kg
Homework Equations
:[/B]The Attempt at a Solution
:[/B]I tried it out very simply using unitary method:
Molality is the number of moles of solute in 1000g of solvent.
1.02g acetic acid has 1ml volume.
So, 1000g acetic acid has 1000/1.02 ml volume.
1000ml acetic acid soln. has 2.05 moles of the acid.
So, 1000/1.02 ml has 2.05/1.02 moles = 2moles.
This answer doesn't match with any answer. Where am I wrong?