# chemistry

The density of 3M solution of NaCl is 1.25 g/mL. Calculate the molality of the soution.

1. 👍
2. 👎
3. 👁
1. 3 M solution means 3 moles solute/L soln.
The soln density is 1.25 g/mL; therefore, 1000 mL soln x 1.25 g/L = 1250 grams for the soln. Part of the 1250 g is water, part NaCl. Since it is 3 moles, that is 3 moles x 58.44 g/mol =175.33 g NaCl. Thus the water portion is 1250-175.33 = ??
Then 3 moles/kg solvent = m

1. 👍
2. 👎
2. suppose you mix 15 g of Na2SO4 and 7.5g of C.Which is the limiting reaction

1. 👍
2. 👎

## Similar Questions

1. ### chemistry

Calculate the molality of a 2.50 molarity NaCl solution. Density of solution = 1.08 g/ml.

2. ### Chemistry

Calculate the molality of 6.00 M H2SO4 solution. The density of the solution is 1.34 g/mL.

3. ### 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,

4. ### chemistry

calculate the mass, in grams, of NaCl present in each of the following solutions. 6.25 g of 11.5% NaCl solution 452 g of 12.3% NaCl solution please show me how to do these. Thanks.

1. ### chem. 7

a 20% solution of H2SO4 has a density of 1.14 g/mL. calculate the molarity, normality and molality of the solution.

2. ### 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?

3. ### Chemistry

Calculate the molarity and the molality of an NH3 solution made up of 30 g of NH3 in 70 g of water. The density of the solution is 0.982 g/ml. Molar Mass of NH3 = 17.04 g

4. ### 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

1. ### Chemistry

The density of an aqueous solution containing 10% of ethanol (C2H5OH) by mass is 0.984 g/ml. A) Calculate the molality of this solution. B) Calculate its molarity. C) What volume of the solution would contain 0.125 mol of ethanol.

2. ### chem

what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density of the solution is 0.78 g/mL

3. ### Chemistry

What is the molality of a glucose solution prepared by dissolving 18.0g of glucose, C6H12O6 in 125g of water? A)0.000794 B)0.144 C)0.699 D)0.794 Molality is the number of moles of solute per kilogram of solvent. Because the

4. ### ChemII

A saline solution is 0.9% NaCl. What masses of NaCl and water would be required to prepare 50. L of this saline solution? Assume that the density of water is 1.000g/mL and that the NaCl does not add to the volume of the solution.