Question 2 Part A List the intermolecular forces operating in each of the follow

Question

Question 2 Part A List the intermolecular forces operating in each of the following liquids. a. H2 O b. CH3OH c. CH3 F d. BF3 Part B List the molecules in part A in order of increasing vapor pressure (from lowest to highest vapor pressure). Part C Classify the following as molecular, ionic, metallic or covalent network solids. a. Graphite b. Diamond c. NaCl d. Fe f. S8 Data Element Atomic wt Electronegativity H 1.01 2.1 B 10.81 2.0 C 12.01 2.5 N 14.00 3.0 O 16.00 3.5 F 19.00 4.0 Molarity = moles /Litre Molality = moles/ kg of solvent = Cm %m/m = ( mass of component / mass of sample) x 100 Tb = Kb.Cm Kb water = 0.512 BP pure water = 100 o C Tf = Kf. Cm Kf water = 1.858 FP pure water = 0.00 o C

Explanation / Answer

A.

(a) H2O

Intermolecular hydrogen bonding

(b) CH3OH

Intermolecular hydrogen bonding

(c) CH3F

Dipole - dipole interactions

(d) BF3

Lodon forces

B.

H2O < CH3OH < CH3F < BF3

Smaller the intermolecualr forces higher is the vapour pressure.

C.

(a) Graphite - Covalent network

(b) Diamond - Covalent network

(c) NaCl - Ionic

(d) Fe - Metallic

(e) S8 - Molecular

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