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Homework Help: Molality homework problem

  1. Mar 8, 2013 #1
    1. The problem statement, all variables and given/known data
    How many grams of NaCl must you add to 750g of water to make a 0.35 molal solution?

    Ans. 7.59g
    2. Relevant equations
    [tex]molality=\frac{mol_{solute}}{kg_{solvent}}[/tex]
    MW of NaCl = 23 + 35.45 = 58.45 g/mole

    3. The attempt at a solution
    [tex]0.35mol/kg=\frac{mass(\frac{1mole}{58.45g})}{0.750kg}[/tex]
    [tex]mass = 15.33g[/tex]
     
  2. jcsd
  3. Mar 9, 2013 #2

    Borek

    User Avatar

    Staff: Mentor

    Looks OK.
     
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