What is the molarity of 750 mL of NaCl solution that contains 21.04 g of NaCl? The Periodic Table A. 0.028 mol/L B.

Question

What is the molarity of 750 mL of NaCl solution that contains 21.04 g of
NaCl?
The Periodic Table
A. 0.028 mol/L
B. 0.48 mol/L
C. 28 mol/L
D. 4.8 x 10-4 mol/L

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Thu Thảo 3 years 2021-07-19T16:38:42+00:00 1 Answers 107 views 0

Answers ( )

  1. Tryphena
    0
    2021-07-19T16:40:23+00:00
    Reply

    Given:

    volume of solution = 750 mL = 0.750 L

    mass of solute = 21.04 g

    solute: NaCl

    Required:

    molarity

    Solution:

    Step 1: Calculate the molar mass of solute.

    molar mass of solute = (22.99 g/mol × 1) + (35.45 g/mol × 1)

    molar mass of solute = 58.44 g/mol

    Step 2: Calculate the number of moles of solute.

    moles of solute = mass of solute / molar mass of solute

    moles of solute = 21.04 g / 58.44 g/mol

    moles of solute = 0.360027 mol

    Step 3: Calculate the molarity.

    molarity = moles of solute / volume of solution

    molarity = 0.360027 mol / 0.750 L

    molarity = 0.48 mol/L

    Answer:

    B. 0.48 mol/L

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