Le Chatelier's Principle: Stress Analysis for N2 and Temperature Changes

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In summary, Le Chatelier's Principle states that a system at equilibrium will adjust to partially offset any external stress and maintain equilibrium. The three main types of external stresses that can affect equilibrium are changes in temperature, pressure, and concentration. Le Chatelier's Principle explains that an increase in temperature will favor the endothermic reaction, while a decrease in temperature will favor the exothermic reaction. In a gaseous system, an increase in pressure will favor the reaction that produces fewer moles of gas, while a decrease in pressure will favor the reaction that produces more moles of gas. Changes in concentration also affect equilibrium, with an increase in concentration favoring the reaction that uses up the substance and a decrease favoring the reaction that produces
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Homework Statement



Do a stress analysis for each change on the following systems.
N2(g) +3 H2 <=> 2 NH3(g) +92kJ

Increase [N2]
Increase temperture

The Attempt at a Solution



What is it looking for when it says a "stress anaylsis", is it just looking for which direction the shift is?

For [N2], the shift would be to the right (away from the increase)
And temperature, the shift would be to the left (away from the heat)
 
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Sounds good to me.
 
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A stress analysis in the context of Le Chatelier's Principle refers to predicting the direction of the equilibrium shift when a system is subjected to a change in one of its variables, such as concentration or temperature. In this case, for an increase in [N2], the equilibrium would shift to the right, as the system would try to counteract the increase in N2 by producing more products (NH3). Similarly, an increase in temperature would cause the equilibrium to shift to the left, as the system would try to consume the excess heat by favoring the endothermic reaction (the reverse reaction, in this case). This stress analysis is important in understanding how changes in variables can affect the equilibrium position and ultimately the amount of product formed in a chemical reaction.
 

FAQ: Le Chatelier's Principle: Stress Analysis for N2 and Temperature Changes

What is Le Chatelier's Principle?

Le Chatelier's Principle, also known as the Equilibrium Law, states that when a system at equilibrium is subjected to an external stress, the system will adjust in such a way as to partially offset the stress and maintain equilibrium.

What types of external stresses can affect a system at equilibrium?

The three main types of external stresses that can affect a system at equilibrium are changes in temperature, pressure, and concentration. These stresses can cause the equilibrium to shift in either the forward or reverse direction.

How does Le Chatelier's Principle explain the effects of changes in temperature on equilibrium?

According to Le Chatelier's Principle, an increase in temperature will favor the endothermic reaction (a reaction that absorbs heat), while a decrease in temperature will favor the exothermic reaction (a reaction that releases heat). This is because the system will try to offset the external stress by favoring the reaction that produces or absorbs heat.

What happens to the equilibrium when the pressure of a system is changed?

In a gaseous system, an increase in pressure will favor the reaction that produces fewer moles of gas, while a decrease in pressure will favor the reaction that produces more moles of gas. This is because the system will try to reduce the pressure by shifting the equilibrium in the direction that produces fewer gas molecules.

How does Le Chatelier's Principle explain the effects of changes in concentration on equilibrium?

If the concentration of one of the reactants or products is increased, the equilibrium will shift in the direction that uses up that substance. On the other hand, if the concentration of one of the reactants or products is decreased, the equilibrium will shift in the direction that produces more of that substance. This is because the system will try to restore the original ratio of reactants and products in order to maintain equilibrium.

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