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 12.0% NaOH by mass?

Homework Answers

Answer #1

Sol :-

(a).

Let mass of the solution = 100 g

So, mass of solute i.e. NaOH = 12 g and

Mass of solvent i.e. H2O = 100 g - 12 g = 88 g

Now, Number of moles of NaOH = nNaOH = 12 g / 40 g/mol = 0.30 mol

Number of moles of H2O = 88 g / 18 g/mol = nH2O = 4.89 mol

Total moles = nT = 0.30 mol + 4.89 mol = 5.19 mol

So,

Mole fraction of solute i.e. NaOH (XNaOH) = nNaOH / nT = 0.30 mol / 5.19 mol = 0.058

Hence, Mole fraction of solute = 0.058

-----------------------------------------------------------------

(b).

We know,

Molality = Number of moles of solute / Mass of solvent in Kg

Molality = 0.30 mol / 0.088 Kg = 3.41 mol/kg or 3.41 m

Hence, Molality of NaOH solution = 3.41 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 13.0% 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 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?
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...
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=___
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
Calculate the molality, molarity, and mole fraction of FeCl3 in a 29.5 mass % aqueous solution...
Calculate the molality, molarity, and mole fraction of FeCl3 in a 29.5 mass % aqueous solution (d = 1.280g/mL)
An aqueous solution contains 4.5 % NaCl by mass. calculate molality. calculate mole fraction
An aqueous solution contains 4.5 % NaCl by mass. calculate molality. calculate mole fraction