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Asked Sep 3, 2019
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A 8.0 m NaCl solution would have what mass percent of NaC in the solution? The molar mass of NaCl is 58.44g.

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Expert Answer

Step 1

Molality is the way to express the concentration of any solution. It can be defined as the number of moles of solute dissolves in 1 kg of the solvent. The mathematical expression for molality can be written as:

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Moles of solute Molaity Mass of solvent(kg)

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Step 2

8 m solution or 8 molal solution of NaCl means 8 moles of NaCl dissolve in 1 kg of solvent. Calculate the mass of NaCl from the given moles and molar mass: 

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Moles of NaCl 8 moles Molar mass of NaCl = 58.44 g/mol Mass of NaCl Moles x molar mass -8 moles x 58.44 g/mol = 467.5 g

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Step 3

Mass percent or weight percent of a solution is the mass of the solute by the mas...

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mass of solute Mass -x 100 Mass of solution mass of solute -x 100 mass of solvent) Mass (Mass of solute

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