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A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in...

Question:

A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL.

Density and moles

To calculate the molar mass of any compound, perform the addition of molar mass of all the atoms used in the compound. To find the molar mass of an element, replace the amu from atomic weight of the element with grams.

Answer and Explanation:

Density of sodium chloride + water = 1.22 g/mL

Density of water = 1 g/mL

So, density of only sodium chloride = 1.22 - 1 = 0.22 g/mL

Volume of solution = 10 mL

So, mass of sodium chloride = Volume* Density = 10* 0.22 = 2.2 g

Molar mass of sodium chloride (NaCl) = 23 g + 35.5 g = 58.5 g

Now, number of moles of NaCl = Mass of NaCl taken / Molar mass of NaCl = {eq}\dfrac{2.2\ g}{58.5\ g} = 0.038 {/eq}


Learn more about this topic:

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Calculating Dilution of Solutions

from Chemistry 101: General Chemistry

Chapter 8 / Lesson 5
155K

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