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chemisrty

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Q4) Suppose you prepare 950 mL of a solution by dissolving 100 grams of NaCl in 900 mL of water. Assuming the density of pure water to be 1 g/mL, answer the following questions with regards to this solution:

a) What is the mass percent of water in this solution?
b) What is molarity of NaCl solution?
c) What is the mole fraction of NaCl in the solution?

  • chemisrty - ,

    a. mass % H2O = (grams H2O/grams soln)*100 = (100g H2O/1000g)*100 = ?

    b. M = moles NaCl/L soln = moles NaCl/0.950 = ?
    moles NaCl = grams NaCl/molar mass

    c. mols NaCl you have.
    mols H2O = grams H2O/molar mass
    total moles = ?

    XNaCl = moles NaCl/total moles.

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