# chemistry

calculate the molality, molarity, and mole fraction of NH3 in an 12.80 mass % aqueous solution (d=0.9651 g/ml)

1. 👍 0
2. 👎 0
3. 👁 542
1. mass % is grams solute/100 g solution.

12.8% w/w is 12.8g NH3/100 g solution.
mass = density x volume. You know 100 g solution and density of the solution; solve for volume of the solution.
Convert g NH3 to mols NH3. g/molar mass = mols.
Then M = mols/L solution.
m = mols solute (same as for M)/kg solvent.
To do mol fraction, convert g NH3 to mols which you did above.'
Convert g H2O to mols.
Then XNH3 = mols NH3/total mols.

1. 👍 0
2. 👎 0
posted by DrBob222

## Similar Questions

1. ### Chemistry

An 8.00 mass % aqueous solution of ammonia has a density of 0.9651g/ml. Calculate the molality, molarity, and mole fraction of NH3. This question seems simple but I cannot seem to remember how to do this. Help please?

asked by ALISON on December 14, 2011
2. ### Chemistry

Calculate the molality, molarity, and mole fraction of FeCl3 in a 39.2 mass % aqueous solution (d = 1.238 g/mL).

asked by Stevi on February 16, 2013
3. ### Chemistry 2

Calculate the molality, molarity, and mole fraction of FeCl3 in a 25.7 mass % aqueous solution (d = 1.204 g/mL).

asked by Anonymous on February 12, 2015
4. ### 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

asked by . on January 26, 2010
5. ### chemistry

Finding molarity and molality(best answer)? An aqueous solution is prepared by diluting 3.30 mL acetone,(d= 0.789g/mL) with water to a final volume of 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity,

asked by sam on October 7, 2011
6. ### Chemistry

I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) = 6.386e-1 Molarity of Dye= 5.322e-3 Calculate the mass percent, molarity, molality and

asked by Emily on November 3, 2011
7. ### 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

asked by Beth on January 5, 2010
8. ### Chemistry

What are the molality and mole fraction of solute in a 32.3 percent by mass aqueous solution of methanol (CH3OH)? molality = ?m mole fraction =

asked by Grace on March 13, 2014
9. ### chemistry

The density of a 15.00% by mass aqueous solution of acetic acid, CH3COOH, is 1.0187g/mL. What is (a) the molarity? (b) the molality? (c) the mole fraction of each component?

asked by alicia on February 11, 2008
10. ### 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.

asked by Sarah on January 21, 2011

More Similar Questions