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Ch.15 - Chemical Equilibrium
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Brown 15th EditionCh.15 - Chemical Equilibrium문제 67
15장, 문제 67

Ozone, O3, decomposes to molecular oxygen in the stratosphere according to the reaction 2 O3(𝑔) ⟶ 3 O2(𝑔). Would increasing the pressure by decreasing the size of the reaction vessel favor the formation of ozone or of oxygen?

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1
Consider Le Chatelier's Principle, which states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change.
In the given reaction, 2 O_3(g) ⟶ 3 O_2(g), compare the number of moles of gas on each side of the equation.
The reactant side has 2 moles of O_3, while the product side has 3 moles of O_2.
Increasing the pressure by decreasing the volume of the reaction vessel will shift the equilibrium towards the side with fewer moles of gas to reduce the pressure.
Since the reactant side has fewer moles of gas (2 moles of O_3) compared to the product side (3 moles of O_2), the equilibrium will shift towards the formation of ozone, O_3.

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주요 개념

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Le Chatelier's Principle

Le Chatelier's Principle states that if a dynamic equilibrium is disturbed by changing the conditions, the system will adjust to counteract the change and restore a new equilibrium. In the context of gas reactions, increasing pressure favors the side of the reaction with fewer moles of gas, as this reduces the overall pressure.
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가이드 코스
07:32
Le Chatelier's Principle

Stoichiometry of the Reaction

The stoichiometry of a chemical reaction describes the quantitative relationship between the reactants and products. In the given reaction, 2 moles of ozone (O3) decompose to form 3 moles of oxygen (O2). This indicates that the product side has more moles of gas than the reactant side, which is crucial for understanding how changes in pressure will affect the reaction.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept

Effect of Pressure on Gas Reactions

The effect of pressure on gas reactions is significant because gases occupy space and their behavior is influenced by changes in volume and pressure. According to the ideal gas law, increasing pressure by reducing the volume of the reaction vessel will shift the equilibrium towards the side with fewer gas molecules, which in this case is the reactants (ozone).
추천 영상:
가이드 코스
02:31
Photoelectric Effect
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(a) Is the dissociation of fluorine molecules into atomic fluorine, F2(𝑔) ⇌ 2 F(𝑔), an exothermic or endothermic process?

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(c) If the temperature is raised by 100 K, does the forward rate constant kf increase by a larger or smaller amount than the reverse rate constant kr?

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Methanol (CH3OH) can be made by the reaction of CO with H2: CO(𝑔) + 2 H2(𝑔) ⇌ CH3OH(𝑔) (c) To maximize the equilibrium yield of methanol, would you use a high or low pressure?

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