If for a particular reversible reaction : Kc = 57 at 355ºC and Kc = 69 at 450º, then

2 1 1 2 K H 1 1 log K 2.303R T T 2 1 2 1 T T & K K So H 0 Paragraph for Questions 28 to 30 Le-Chatelier’sprinciple :If a system at equilbrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to “Nullify” the effect of that change. Change of Pressure : If a system in equilibrium consists of gases, then the concentrations of all components can be altered by changing the pressure. When the pressure on the system is increased, the volume decreases proportionately. The total num