Question

What is the mole fraction, X, of solute and the molality, m (or b), for an...

What is the mole fraction, X, of solute and the molality, m (or b), for an aqueous solution that is 19.0% NaOH by mass?

hint: Molality, m (or b), is the number of moles of solute per kilogram of solvent. Mole fraction, X, is the number of moles of a component divided by the total number of moles. Choose an arbitrary mass of solution, such as 100 g, and determine the masses of NaOH and H2O. Then convert those values to moles or kilograms as necessary.

Homework Answers

Answer #1

19 % NaOH by mass that mean in 100 gm of solution contain 19 gm of NaOH and 81 gm of water

molar mass of NaOH = 39.997 gm/mole then 19 gm NaOH = 19/39.997 = 0.475 mole

molar mass of water = 18.01528 gm/mole then 81 gm of water = 81/18.01528 = 4.496 mole

total mole = 0.475 + 4.496 = 4.971 mole

mole fraction = no. of mole of indivisual molecule / total mole of solution

mole frction of NaOH = 0.475 / 4.971 = 0.09555

mole fraction of NaOH(X) =  0.09555

molality = no.of mole of solute / solvent in kilogram

no. of mole of NaOH = 0.475 mole

100 gm = 0.1 Kg

molality of NaOH = 0.475 / 0.1 = 4.75 m

molality of NaOH = 4.75 m

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
What is the mole fraction, X, of solute and the molality, m (or b), for an...
What is the mole fraction, X, of solute and the molality, m (or b), for an aqueous solution that is 19.0% NaOH by mass?
What is the mole fraction, X, of solute and the molality, m (or b), for an...
What is the mole fraction, X, of solute and the molality, m (or b), for an aqueous solution that is 19.0% NaOH by mass?
What is the mole fraction, X, of solute and the molality, m (or b), for an...
What is the mole fraction, X, of solute and the molality, m (or b), for an aqueous solution that is 12.0% NaOH by mass?
What is the mole fraction, X, of solute and the molality, m (or b), for an...
What is the mole fraction, X, of solute and the molality, m (or b), for an aqueous solution that is 13.0% NaOH by mass?
What is the mole fraction, X, of a solute and the molality, m (or b), for...
What is the mole fraction, X, of a solute and the molality, m (or b), for an aqueous solution that us 18.0% NaOH by mass?
Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction...
Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction of ethanol is 0.397. Give your answer to 2 decimal places Calculate the boiling point (in degrees C) of a solution made by dissolving 6.81 g of sucrose (C12H22O11) in 99.7 g of acetone. The Kbp of the solvent is 1.71 K/m and the normal boiling point is 56.2 degrees C. Give your answer to 2 decimal places When 11.8 g of an unknown,...
What is the mole fraction of solute in a 3.55 m aqueous solution?
What is the mole fraction of solute in a 3.55 m aqueous solution?
Calculate the molality, molarity, and mole fraction of FeCl3 in a 23.0 mass % aqueous solution...
Calculate the molality, molarity, and mole fraction of FeCl3 in a 23.0 mass % aqueous solution (d = 1.230 g/mL). molality=____m molarity=____M mole fraction=___
1) When a mole fraction of a solute is one, based on the definition there is?...
1) When a mole fraction of a solute is one, based on the definition there is? a) 1.0 g of solute per 100g of solution b) is a 1:1 ratio of solute to solvent c) only solute present d) 1.0 mole of solute and 99 moles of solvent e) only solvent present 2) Curious George put on goggles, went into the lab and measured out 25.0 mL of 3.00 M hydrochloric acid and added it to a beaker containing 100.0...
the mole fraction of sucrose in an aqueous solution is 0.100. Calculate the molality of sucrose...
the mole fraction of sucrose in an aqueous solution is 0.100. Calculate the molality of sucrose in the solution. the molar mass of sucrose is 342.3 g/mol