5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C 9.31 M D 33

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5. 16.3 g of NaCl is dissolved in water to make 1.75 L of solution. What is the molarity of this solution? A 0.159 M B 0.278 M C 9.31 M D 33.4 M​

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Dulcie 4 years 2021-08-06T22:17:01+00:00 1 Answers 35 views 0

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  1. King
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    2021-08-06T22:18:38+00:00
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    Answer: The molarity of this solution is 0.159 M.

    Explanation:

    Given: Mass of solute = 16.3 g

    Volume = 1.75 L

    Number of moles is defined as the mass of substance divided by its molar mass.

    Hence, moles of NaCl (molar mass = 58.44 g/mol) ar calculated as follows.

    Moles = \frac{mass}{molar mass}\\= \frac{16.3 g}{58.44 g/mol}\\= 0.278 mol

    Molarity is the number of moles of a substance present in a liter of solution.

    So, molarity of the given solution is calculated as follows.

    Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.278 mol}{1.75}\\= 0.159 M

    Thus, we can conclude that the molarity of this solution is 0.159 M.

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