chemisrty

posted by lyan

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?

  1. DrBob222

    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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