Experiment 2 - The Effect of Antifreeze in the Physical Properties of Water What

Question

Experiment 2 - The Effect of Antifreeze in the Physical Properties of Water What arc the possible types of intermolecular forces? Identify the intermolecular forces present in each of the following: a. Water b. Sodium chloride c. Methanol (CH3OH) d. Sulfur dioxide e. Carbon tetrafluoride Arrange intermolecular forces in order of strength from the strongest to the weakest How would the strength of intermolecular force be related to the boiling point of a solution? List the tour colligative properties How is each of the colligative properties affected by the present of a solute? 25.7 grams of glucose. C6H12O6 are dissolved in 250 grams of water. The density of the solution is 1.07 g/mL. Calculate a. the percent by mass, b. molarity, c. molality, d. mole fraction of the solution 12.00 grams of a solid are added to 200.0 grams of benzene. The mixture boiled at 81.27 degree C. What is the molar mass of the solid? The BP of Benzene is 80.1 degree C. Kb = 2.53 degree C/m. How would you discard of the antifreeze?

Explanation / Answer

1 -

Intermolecular forces are forces of attraction or repulsion which act between neighboring particles (atoms, molecules or ions). They are weak compared to the intramolecular forces, the forces which keep a molecule together. For example the covalent bond, involving the sharing of electron pairs between atoms is much stronger than the forces present between the neighboring molecules. They are an essential part of force fields used in molecular mechanics.

2 - H2O - Hydrogen bonding

NaCl - Dipole - dipole interaction

CH3OH - Hydrogen bonding

SO2 - Dipole - dipole

CF4 - dipole - dipole

4 -- Vaporization of liquid , at boiling point required energy to over come intermoleculer force of attraction between the molecule. Boiling point are therefore, more indicative the strenth of intermoleculer force.

3 - Londondisperstion <dipole - dipole <H -bonding < ion-ion

5 - a-Lowering of vapor pressuer

b-Elevation of boiling point

c-Diperation of freezing point

d-Osmotic pressure

6 - Each thes properties depends on the number of solute particles irrespective of their nature relative to the total no. of particle present in solution.

7-wt of C6H12O6=25.7g

wt of H2O=250g Wt of solu.=275.5g

%mass=257 /2755x100=9.32

density of solu=1.07g /ml

volume of solution=m / d=275.5 /1.07=257.476ml

mole of glucose=25.7 /180=0.143

molarity=0.143 /257.476x1000=5.554M

molality=0.143/275.5x1000=5.19m

molefraction of solution=1

8-M2=1000xw2xKb / delta Tbxw1

M2=1000x12x2.53x /(81.27-80.1)x200

1000x30.36/1.17x200=129.74

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.