A 7.00 g sample of NaCl was dissolved in enough water to give 250 mL solution. What is the molarity of the solution?

Question

A 7.00 g sample of NaCl was dissolved in enough water to give 250 mL solution.
What is the molarity of the solution?

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Tryphena 2 weeks 2021-08-29T19:13:25+00:00 1 Answers 0 views 0

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    2021-08-29T19:15:22+00:00

    Answer: The molarity of given solution is 0.476 M.

    Explanation:

    Given : mass of sample (solute) = 7.0 g

    Volume of solution (solvent) = 250 mL

    Convert mL into L as follows.

    1 mL = 0.001 L\\ 250 mL = 250 mL \times \frac{0.001 L}{1 mL}\\= 0.25 L

    Molar mass of NaCl is 58.44 g/mol. Hence, moles of NaCl are calculated as follows.

    No. of moles = \frac{mass}{molar mass}\\= \frac{7.00 g}{58.44 g/mol}\\= 0.119 mol

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

    So, molarity of given solution is calculated as follows.

    Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.119 mol}{0.25 L}\\= 0.476 M

    Thus, we can conclude that molarity of given solution is 0.476 M.

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