UNIVERSITI TUNKU ABDUL RAHMAN Centre Course Year/ Trimester Lecturer : : : : Centre for Foundation Studies Foundation In Science Year 1 Trimester 1 Unit Code Unit Title Session : : : FHSC1114 Physical Chemistry 2013/05

Ms. Jamie, Mr. Lai Kin Foong, Ms. Lau Mei Chien, Ms. Precilla, Ms. Rajalakshmi, Ms. Saziana, Ms. Tan Lee Siew.

Tutorial 7: Chapter 6 Reaction Kinetics & Chapter 7 Equilibria 1. Sulfuryl chloride, SO2Cl2, is a colorless, corrosive liquid whose vapor decomposes in a first-order reaction to sulfur dioxide and chlorine. SO2Cl2 (g) → SO2(g) + Cl2(g) At 200 °C, the half life of SO2Cl2 vapor is 3.00 × 103 seconds. Determine the rate constant for this reaction. 2. The gas phase decomposition of HI HI(g) → ½ H2(g) + ½ I2(g) has the rate equation as below :
− ∆[ HI ] = k[ HI ]2 ∆t

where k = 30 M-1min-1 at 443 °C. How much time does it take for the concentration of HI to drop from 0.01M to 0.005M at 443oC? 3. When temperature of a reaction is increased from 150 °C to 250 °C, the rate constant increases 1.5 x 103 times. Determine the activation energy for this reaction. Consider the following reaction and its equilibrium constant: I2 (g) + Cl2 (g) 2ICl (g) Kp = 81.9

4.

A reaction mixture contains PI 2 = 0.114 atm, PCl2 = 0.102 atm and PICl = 0.355 atm. Is the reaction mixture is at equilibrium? If not, in which direction will the reaction proceed?

5.

Nitrogen monoxide, a pollutant in automobile exhaust, is oxidized to nitrogen dioxide in the atmosphere according to the following equation: 2 NO (g) + O2 (g) Find Kc for this reaction. 2 NO2 (g)
Kp = 2.2 x 1012 at 25oC

6.

Determine whether Kp = Kc for the following reactions: (a) (b) (c) 2 Na2O2 (s) + 2 CO2 (g) NiO (s) + CO (g) NH4NO3 (s) 2 Na2CO3 (s) + O2 (g) Ni (s) + CO2 (g) N2O (g) + 2 H2O (g)

APPENDIX: 1. Gas constant, R = 0.082057 L.atm.K-1.mol-1 = 8.314 N.m.K-1.mol-1 = 8.314 J.K-1.mol2. 0 oC = 273.2 K