Chem
posted by Ryan .
An aqueous KNO3 solution is made using 82.7 grams of KNO3, diluted to a total solution volume of 1.50 L. The density of this solution is 1.05 g/mL. What is the molality of this solution?

Chem 
DrBob222
moles KNO3 = grams/molar mass
Solve for moles.
mass soln = volume x density = ??
mass H2O = total mass soln  mass solute.
molality = moles/kg solvent 
Chem 
Ryan
so correct me if i may be wrong...
82.7gKNO3x1mol/101.11gKNO3=0.8179mol
1.5Lx1000ml/1Lx1.05g/1mL=1575g
157582.7=1492.3g
0.8179mol/1.4923kg=0.54808molal? 
Chem 
DrBob222
I agree but you have too many significant figures. You're allowed only 3.
Respond to this Question
Similar Questions

chem
a 45.8mL sample of a 5.8 M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0g KNO3? 
chem
an aq. solution(NaCl) made by using 133g diluted to a total solution volume of 1 L.Calculate the molarity, molality & mass % of the solution(density of solution = 1.08g/mL) [ans: M=1.92M, m=2.0m, 10.4 %] i need the calculation work … 
chemistry
A KNO3 solution is made using 88.4g of KNO3 and diluting to a total soultion volume of 1.50l. Calculate the molarity and mass percent of the solution. Assume a density of 1.05 g/mL for the solution. 
chemistry
A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3. 
Chemistry
An aqueous KNO3 solution is made using 72.5 grams of KNO3 diluted to a total solution volume of 2.00 liters. If the molarity of the solution is .359 M and the molality of the solution is .354, what is the mass percent of the solution? 
chemistry
An aqueous solution is made using 137g of diluted to a total solution volume of 1.30L .Calculate the molarity.molality and mass percent of solution.*assume a density of 1.08g/ml for the solution.. 
Chemistry
An aqueous KNO3 solution is made using 73.4g of KNO3 diluted to a total solution volume of 1.86 L. Calculate the molarity of the solution. (Assume a density of 1.05 g/ml for the solution.) 
CHEMISTRY
A) We have an experiment , using the solution of KNO3 , measured freezing point of solution is 1.15 degree , and using a sample of pure water the thermometer read o.25 degree as freezing point of the sample , calculate the molal concentration … 
Chemistry
Determine the volume, in milliliters, required to prepare each of the following diluted solutions. 40.0mL of a 2.75M KNO3 solution using a 1.00M KNO3 solution 45.0mL of a 2.90M H2SO4 solution using a 6.00M H2SO4 solution 0.700L of … 
Molarity
A 44.8−mL sample of a 7.0M KNO3 solution is diluted to 1.10L What volume of the diluted solution contains 16.0g of KNO3?