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12 January, 17:15

If molarity = moles liter, then how many grams of NaCl are needed to make 1 liter of a 0.1 M solution? A) 0.0584 g NaCl B) 3.246 g NaCl C) 5.844 g NaCl D) 58.44 g NaCl

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Answers (2)
  1. 12 January, 17:31
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    The grams of NaCl that needed to make 1L of a 0.1 M solution is

    5.845 g (answer C)

    calculation

    Step 1: find the moles of NaCl

    moles = molarity x volume in liters

    molarity = 0.1 M = 0.1 mol/l

    = 1 L x 0.1 Mol/L = 0.1 moles

    Step 2: find the mass NaCl

    mass = moles x molar mass

    From periodic table the molar mass of NaCl = 23 + 35.45 = 58.45 g/mol

    mass = 0.1 moles x 58.45 g/mol = 5.845 g appropriate (answer C)
  2. 12 January, 18:29
    0
    Answer : Option C) 5.844 g NaClExplanation:

    To calculate the number of grams of NaCl that would be needed to make 0.1 M of solution we have to calculate;

    The molecular weight of sodium chloride (NaCl) which is 58.44 g, so one gram molecular weight will be = 1 mole which is 58.44 g. By dissolving 58.44 g of NaCl upto the final volume of 1 litre, one can get 1 M NaCl solution. So, to make 0.1 M NaCl solution we have to dilute the mass of salt to 1000 ml of solution as follows; 0.1 M NaCl solution will require 0.1 x 58.44 g of NaCl = 5.844 g. of NaCl.
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