Question
Asked Oct 23, 2019
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What is the percent by mass of NaCl in 1.60 M NaCl solution? Assume that the solution
has a density of 1.06 g/mL

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Expert Answer

Step 1

The number of moles of NaCl (n) is calculated in 1 liter (or 1000 mL) of solution using equation (1) in which C is the molarity and V is the volume of solution.

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п С - V (1) п 1.60 M 1.0 L n 1.60 mol

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Step 2

The mass of NaCl (m) in solution is calculated using equation (2) in which Mm is the molar mass of NaCl.

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т п%3- М, (2) т 1.60 mol= 58.44 g/mol т%3D93.5 g

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Step 3

The mass of solution (ms) is calculated using equation (3) in which d is the density ...

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т, d = V (3) т, 1.06 g/mL = 1000 mL т, 3D 1060 g

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