A NaOH solution has a density of 1.22 g/mL and is 20.0 wt % NaOH. What...

Question

Question

A NaOH solution has a density of 1.22 g/mL and is 20.0 wt % NaOH. What is the molality of the solution?

Answer 1

Answer #1

20wt%NaOH means 20g of NaOH present in 100g of solution

mass of solute( NaOH) = 20g

mass of solution = 100g

mass of solvent = mass of solution - mass of solute

= 100-20 = 80g

molar mass of NaOH = 40g/mole

molality = mass of solute * 1000/gram molar mass of NaOH * mass of solvent in g

= 20*1000/(40*80)

= 6.25m >>>>>answer

Answer 2

Similar Homework Help Questions

What is the density of 45.0 wt% aqueous NaOH (FM 40.00) if 17.0 mL of the...

What is the density of 45.0 wt% aqueous NaOH (FM 40.00) if 17.0 mL of the solution diluted to 1.78 L give 0.159 M NaOH? g/mL
Please show all work! An aqueous solution contain 20.0 Wt % KI has a density of...

Please show all work! An aqueous solution contain 20.0 Wt % KI has a density of 1.168 g/mL. Find the Molarity (M) of this solution.
A 44% wt/wt solution of H2SO4 has a density of 1.343g/ml. What mass of H2SO4 is...

A 44% wt/wt solution of H2SO4 has a density of 1.343g/ml. What mass of H2SO4 is 60ml of this solution?

a solution contains 3.2 g NaOH (mw = 40) in 20.0 ml of solution. what is the molarity of the solution?

a solution contains 3.2 g NaOH (mw = 40) in 20.0 ml of solution. what is the molarity of the solution?
U Lg Hwy ML ULE 2. What is the density of 53.4 wt% aqueous NaOH (FM...

U Lg Hwy ML ULE 2. What is the density of 53.4 wt% aqueous NaOH (FM = 40.00) if 16.7 ml of the solution diluted to 2.00 L result in a 0.169 M NaOH solution?
Calculate the molality of a 20.0% by mass ammonium sulfate (NH4)2SO4 solution. The density of...

Calculate the molality of a 20.0% by mass ammonium sulfate (NH4)2SO4 solution. The density of the solution is 1.117 g/mL.

What is the mass of 20.0 mL of an intravenous glucose solution with a density of...

What is the mass of 20.0 mL of an intravenous glucose solution with a density of 1.15 g/mL? OA 17.4 g В 23,0 g С 0.0575 g O D 21.2 g
c. A 15.0% stock solution of NaOH has a density of 1.13 g/mL. How would you...

c. A 15.0% stock solution of NaOH has a density of 1.13 g/mL. How would you prepare 250.0 mL of a 0.150 M solution of NaOH from this stock solution? (3 pts)
What is the molality of 318 g sodium hydroxide, NaOH, dissolved in 3187 mL solution?

What is the molality of 318 g sodium hydroxide, NaOH, dissolved in 3187 mL solution?

A concentrated HNO3 (MW = 63.0128 g/mol) solution is 70.0 %wt HNO3 and has a density...

A concentrated HNO3 (MW = 63.0128 g/mol) solution is 70.0 %wt HNO3 and has a density of 1.42 g/mL. How many milliliters of the concentrated HNO3 solution must be diluted to obtain 500.0 mL of 1.00 M HNO3?