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Calculations- molar concentrations PLS HELP

  1. Apr 26, 2006 #1


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    Hi, I need help with this question

    what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution?

    =moles of solute/leters of solution
    =1.7 mol/L

    Is this correct?


    what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution

    I have no idea how to do this one
  2. jcsd
  3. Apr 26, 2006 #2
    Yes, it is. :tongue:

    First find how many moles of Ca(OH)2 there is.
    nCa(OH)2 = CCa(OH)2 x Vsolution

    Then find the mass of that number os moles:

    mCa(OH)2 = nCa(OH)2 x M(Ca(OH)2)

    M stands for molar mass.
  4. Apr 26, 2006 #3


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    ^ ok, thank you
    Last edited: Apr 26, 2006
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