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12 March, 01:17

2. How many grams of sodium fluoride (NaF) are needed to prepare a 0.400m NaF

solution that contains 750 g water? (molar mass of NaF - 42.0 g/mol)

20%

A 18.9 g NaF

OB 9.12 g NaF

c 12.6 g Naf

OD 28.0 g Naf

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Answers (1)
  1. 12 March, 01:39
    0
    12.6 g NaF

    Explanation:

    Recall that 1g of water = 1 ml of water hence the volume of the solution is 750ml

    Given that

    m/M = CV

    m = mass of solute = ?

    M = molar mass of solute = 42.0 g/mol

    C = concentration of solution = 0.400 M

    V=volume of solution = 750ml

    m = MCV

    m = 42.0g/mol * 0.400 M * 750/1000

    m = 12.6 g of NaF
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