Chemistry

posted by .

An aqueous solution is 8.50% ammonium chloride, NH4Cl, by mass. The density of the solution is 1.024g/mL. Calculate the molality, mole fraction, and molarity of NH4Cl in the solution.

I know the formulas needed but I'm not sure where to start.

M = moles solute/1 L solution

m = moles solute/1 kg solvent

x = moles solute/total moles of solution

Can I have some help please with where to get started on this problem? :) Thanks!

  • Chemistry -

    I would start with 8.50% NH4Cl which you know means 8.50 g NH4Cl per 100 g soln.
    You know the density so you can convert 100 g soln to volume (mL) and convert 8.50 g NH4Cl to moles. That gives you an easy M = moles/L soln.
    Next I would look at the % soln again. You know that is 8.50 g NH4Cl/(8.50g NH4Cl + 91.50g H2O). You know moles from the earlier step so this give you an easy m = moles/kg solvent.
    Now that you know moles NH4Cl and kg solvent, you can convert to moles solvent and get X from that for NH4Cl (and X for H2O if you want it).

  • Chemistry -

    Thanks so much for the feedback! I think I figured the answers out! :)

    Molarity = 0.161 M

    Molality = 1.74 m

    Mole Fraction = 1.57E-4 moles NH4Cl

  • Chemistry -

    Made a mistake.

    ****Mole Fraction = 0.0303 moles NH4CL

  • Chemistry -

    I obtained 1.627 which rounds to 1.63 for M. I used 53.49 for the molar mass NH4Cl.
    I agree with the other two answers.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. AP Chemistry

    An aqueous sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution at 20°C has a density of 1.3294 g/mL. Calculate (a) the molarity, (b) the molality, (c) the percent by mass, and (d) the mole fraction of H2SO4 for …
  2. CHM 152

    At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution?
  3. Chemistry

    An aqueous solution of H2SO4 is 60.0 % H2SO4 by mass. The density of the solution is 0.968 g/mL . I need to find the Molality, mole fraction, and Molarity.
  4. Chemistry

    An aqueous antifreeze solution is 40.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.05 g/cm3. Calculate the molality, molarity, and mole fraction of the ethylene glycol.
  5. chemistry

    Finding molarity and molality(best answer)?
  6. Chemistry

    Household vinegar is acqueous 5.00%,acetic acid solution(by mass),if its density is 1,01 g/ml.calculate the mole fraction!molarity,and molality of the solution.
  7. chemistry

    what mass of ammonium chloride is dissolved in 100 grams water in each of the following solutions in 1.10 molal NH4Cl solution, in a solution which is 75% water by mass in solution with a mole fraction of 0.15 NH4Cl?
  8. Chemistry

    At 20°C, an aqueous solution that is 18.0% by mass in ammonium chloride has a density of 1.0512 g/mL What is the molarity of ammonium chloride in the solution?
  9. Biology

    3grams of ammonium chloride has been added to 20mL of water. The initial temperature of the solutionis 18.0 degrees, and once the ammonium is added to the water, the temperature declines to 11 degrees. Given the following information, …
  10. chemistry

    When 25 mL of C2H5OH (density 0.80 g.cm-3) is dissolved in water to prepare a 250 mL solution, the density of the solution was found to be 0.950 g.cm-3. Calculate a. Molarity of pure ethanol; b. Molarity of ethanol in the final solution; …

More Similar Questions