1. Mole Fraction

2. Mole Fraction (X)
is the number of moles of that component divided by the total number of moles of solute and solvent.
X = Moles of component
Total moles of solution

3. Mole Fraction (X) XSolute = Moles of solute Total moles of solution
XSolvent = Moles of solvent
Where:
Xsolute + XSolvent = 1

4. 1. An industrial gas contains 64. 0g of SO2 in every 750. 0g of CO2
1. An industrial gas contains 64.0g of SO2 in every 750.0g of CO2. What is the mole fraction of SO2?
Given: Mass of Solute – 64.0 g Mass of Solvent – g Formula: X = Moles of component Total moles of solution
Answer:
Moles solute = Mass of Solute
Molar Mass of Solute
= 64.0 g
32+ (16)2g/mole
= 1 mole
Answer:
Moles solvent = Mass of Solvent
Molar Mass of Solvent
= g
12+ (16)2g/mole
= mole

5. Given: Moles of Solute – 1 mole Moles of Solvent – 17
Given: Moles of Solute – 1 mole Moles of Solvent – moles Formula: Mole Fraction = Moles of component Total moles of solution Answer: XSO2 = Moles of SO2 Total moles of Solution = 1 mole mole =

6. 2. 100 mole of NaCl is dissolved into 100. 0 grams of pure H2O
mole of NaCl is dissolved into grams of pure H2O. What is the mole fraction of NaCl?
Given: Mole of Solute – mole Mass of Solvent – g Formula: X = Moles of component Total moles of solution
Answer:
Moles solvent = Mass of Solvent
Molar Mass of Solvent
= g
g/mole
= 5.56 mole
Answer:
XNaCl = Moles of NaCl
Total moles of Solution
= mole
mole
= 0.018

7. SEATWORK
1. A g isopropyl alcohol (C3H7OH) is dissolved in a 80 g of water. Calculate mole fraction of isopropyl alcohol in the solution.

8. Given: Mass of Solute – 12. 60 g Mass of Solvent – 80
Given: Mass of Solute – g Mass of Solvent – 80.0 g Formula: X = Moles of component Total moles of solution
Answer:
Moles solute = Mass of Solute
Molar Mass of Solute
= g
(12)3 + (1) g/mole
= 0.21 mole
Answer:
Moles solvent = Mass of Solvent
Molar Mass of Solvent
= 80.0 g
g/mole
= 4.44 mole

9. Given: Moles of Solute – 0. 21 mole Moles of Solvent – 4
Given: Moles of Solute – 0.21 mole Moles of Solvent – 4.44 moles Formula: X = Moles of component Total moles of solution Answer: XSolute = Moles of C3H7OH Total moles of Solution = 0.21 mole mole = 0.045