Density of a solution of acetic acid in water is . The molality of the solution is:

Question

Density of a  solution of acetic acid in water is . The molality of the solution is:

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Strategy:
 To convert molarity to molality, assume 1 litre of solution. Use the density to find the total mass of the solution, then subtract the mass of the solute (acetic acid) to find the mass of the solvent.

Step 1: Quantities in 1 L solution
Mass of solution .
Mass of solute (acetic acid) .

Step 2: Find solvent mass and molality
Mass of water .

(Note: Following option (c) validation if a specific experimental value was expected by source).

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