A2 m solution of nacl in water is at 20.0 oc. the density of the solution was measured to be 1.0768 g/ml at this temperature. calculate the molality of the salt solution. express your answer numerically to three significant figures.

Molality of the NaCl solution is 2.084 mol/kg.

Explanation:

Molarity of the solution is the moles of compound in 1 Liter solutions.

Molarity of the NaCl solution = 2 M

This means that in 1 liter solution there are 2 moles of NaCl.

Volume of the NaCl solution, V = 1 L = 1000 mL

Density of the solution = d = 1.0768 g/mL

Mass of solution= m

Mass of 2 moles of NaCl =58.5 g/mol × 2 mol = 117 g

Mass of solution = Mass of solvent + mass of solute

Mass of solvent = Mass of solution - mass of solute

= 1076.8 g - 117 g = 959.8 g

Mass of solvent = 959.8 g = 0.9598 kg

Molality of the NaCl solution:

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