Chemistry

An aqueous solution contains 2.0 % NaCl by mass.

(1) Calculate the molality (NOT molarity!) of the solution.
(2) Calculate the mole fraction of the solution.


I know how to solve both but the problem is missing one other compound/element.

I know that molality is moles per kg of the solvent but I don't know what the solvent is. Is it water? Then how many kg of water?

As for the mole fraction, I know that number of moles of NaCl divided by the total number of moles but where will I get that other mole? Is it water again? How many will I use?


Thanks!

asked by .
  1. exactly what does "aqueous" mean?

    posted by bobpursley
  2. So how many grams and moles of water will I use? I know water is missing compound and for the molality calculation, how many will I use? 1 gram and then covert that to kg?

    How many moles will I use? One mole?

    posted by .
  3. Nevermind, I got it. It was simply 100g minus 2g of NaCl (mass of the solvent, water).

    posted by .

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. whats wrong 25 g NaCl
  2. chemistry

    a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. help please 25g/58.44g
  3. chemistry

    What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous
  4. Molality

    An aqueous solution contains 8.7% NaCl by mass. 1. Calculate the molality of the solution. 2. Calculate the mole fraction of the solution.
  5. science

    a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.
  6. science

    a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.
  7. college chemistry

    a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.
  8. chemistry/ molarity, molality

    A solution is made by mixing 20.0 mL of C6H5CH3, d=.867g/mL, with 140.0mL of C6H6, d=.874g/mL. assuming that the volumes add upon mixing, what is the molarity? what is the molality? i know that molarity= moles/L and molality=
  9. Chemistry

    An aqueous solution contains 2.6 %NaCl by mass. Calculate the molality of the solution.
  10. "Given Molality, calculate..."

    "Given: An aqueous solution of C6H12O6 with a density of 1.18 g/ml" I) Calculate Molarity 1) It firsts asks me to, "State the moles of solute" 2) Calculate the mass of the solute in grams - I think I can do this if I know how to

More Similar Questions