Consider the equilibrium reaction represented by the equation: 2SO2(g) + O2(g) ⇌ 2SO3(g) ∆H = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings aboutA. decrease in rate of the reaction of the systemB. decrease in temperature of the systemC. increase in temperature of SO3D. increase in concentration of SO2
Question
Consider the equilibrium reaction represented by the equation: 2SO2(g) + O2(g) ⇌ 2SO3(g) ∆H = - 197 kJmol-1. At equilibrium, increase in the total pressure of the system brings aboutA. decrease in rate of the reaction of the systemB. decrease in temperature of the systemC. increase in temperature of SO3D. increase in concentration of SO2
Solution
The question is referring to Le Chatelier's Principle, which states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change.
In this case, the reaction is exothermic (ΔH is negative), meaning it releases heat. The reaction also involves a decrease in the number of moles of gas (3 moles of gas on the left side of the equation and 2 moles on the right).
A. An increase in total pressure does not directly affect the rate of the reaction. The rate of a reaction is determined by the activation energy and the temperature, not the pressure.
B. The pressure change does not directly affect the temperature of the system. However, according to Le Chatelier's principle, an increase in pressure will shift the equilibrium to the side with fewer moles of gas to reduce the pressure, in this case, to the right. This shift to the right is exothermic and would release heat, potentially increasing the temperature of the surroundings, but not the system itself.
C. The temperature of SO3 would not directly increase due to an increase in total pressure. However, as the equilibrium shifts to the right to counteract the increased pressure, more SO3 is produced, which could potentially increase its concentration, not its temperature.
D. An increase in total pressure would actually decrease the concentration of SO2. According to Le Chatelier's principle, the system will respond to an increase in pressure by shifting the equilibrium to the side with fewer moles of gas. In this case, that's the right side of the equation, where SO2 is being consumed to produce SO3. So, the concentration of SO2 would decrease, not increase.
So, none of the options given are correct. The correct response would be "an increase in the concentration of SO3".
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