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At 27°C, 58.5g of sodium chloride is…

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How does sodium chloride (NaCl) dissolve in water?

How does sodium chloride (NaCl) dis...
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At 27°C, 58.5g of sodium chloride is present in 250cm^3 of a solution. The solubility of sodium chloride at this temperature is?

( molar mass of sodium chloride = 111.0 g/mol )

At 27°C, 58.5g of sodium chloride is... » QuizTablet

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A

SOLUTION 

In this question, we are required to find the molar solubility.

Data given:

Mass of sodium chloride = 58.5g

Volume of solution = 250 cm-cube = 250/1000 = 0.25 dm-cube

Molar mass of sodium chloride = 111 g per mol

Molar solubility = mass solubility/molar mass

But mass solubility = mass of sodium chloride/volume of solution

Mass solubility = 58.5/0.25 = 234 g/dm-cube

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Finally, Molar solubility = 234/111 = 2.11 mol/dm-cube

Now for the right answer to the above question:

  1. Option A is correct.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is not the correct answer.

QUICK TIPS…

You may please note these/this:

  • Molar mass of sodium chloride can never be 111.0 g/mol.
  • This is why our professionals believe this question needs fundamental reviews.
  • The actual value for the molar mass of NaCl = 23 + 35.5 = 58.5 g/mol.
  • If we use 58.5 g/mol as the molar mass, our solubility here becomes 234/58.5 = 4mol/dm^3.
  • Just be sure of yourself, sometimes typo-errors could arise in the course of compiling questions.

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/culled from 2019 JAMB-UTME Chemistry question 31/

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