State which is greater in amount: reactants or products, based on the given equilibrium constant, K. a) N 2 (g) + O 2 (g) ⇌ 2 NO (g) K = 1.0 x 10 20 b) 2 CO (g) + O 2 (g) ⇌ 2 CO 2 (g) K = 2.2 x 10 -22 c) 2 BrCl (g) ⇌ Br 2 (g) + Cl 2 (g) K = 1

Okay guys. We're not going to tackle the practice question that was left on the bottom of the page dealing with our equilibrium constants. The question says, state which is greater in amount, reactants or products based on the given equilibrium constant k. Remember, we've talked about this before. When k is greater than 1, then we're going to say that products are greater than reactants and the forward direction is favored. Now, if k is a very, very large number, then that means we just have that much more products than reactants. To the 20. 10 to the 20, that's a huge number. So it's clear that products are products are greater than reactants. In the second one, it's 2.2 times 10 to the negative 2. That's an incredibly small number because of the negative exponent. We say that if k is less than one, then reactants are greater than products and the reverse direction will be favored. So here, we're going to say reactants are greater than products. Finally, when k is equal to 1, we've also talked about this situation. We say that when k is equal to 1, our products and our reactants are equal to one another. Because remember, k equals products over reactants. The only way that k could equal 1 is if the top and the bottom part are equal to one another. So here we're going to say they are equal. Now, if your professor gave you a number that was different, let's say they gave you k was 20 5. We'd say that k is greater than 1 so products are our favourite. But 25 is not an incredibly large number. So we would say in that case that products are greater than reactants but there's still a good amount of reactants in comparison. If our number was let's say 0.1, it'd be less than 1, so reactants would be greater. But 0.1 is not an incredibly small number from 1. So we'd say we have obviously more reactants but we'd still have an appreciable or a good amount of products. So that's the way you're supposed to understand equilibrium constant in order to find out who's greater in amount and by how much they're greater by.

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1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

7. Energy, Rate and Equilibrium

The Equilibrium Constant

GOB Chemistry

7. Energy, Rate and Equilibrium

The Equilibrium Constant

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Multiple Choice

State which is greater in amount: reactants or products, based on the given equilibrium constant, K.
a) N₂ (g) + O₂ (g) ⇌ 2 NO (g) K = 1.0 x 10²⁰
b) 2 CO (g) + O₂ (g) ⇌ 2 CO₂ (g) K = 2.2 x 10^-22
c) 2 BrCl (g) ⇌ Br₂ (g) + Cl₂ (g) K = 1

a) products, b) products, c) reactants

a) reactants, b) products, c) reactants

a) products, b) reactants, c) equal

a) reactants, b) products, c) equal

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Understand the concept of the equilibrium constant (K). It is a measure of the ratio of the concentration of products to reactants at equilibrium. A large K value indicates that the equilibrium favors the formation of products, while a small K value indicates that the equilibrium favors the formation of reactants.

For part (a), the equilibrium constant K is 1.0 x 10^20, which is a very large number. This suggests that the concentration of products (NO) is much greater than the concentration of reactants (N2 and O2) at equilibrium.

For part (b), the equilibrium constant K is 2.2 x 10^-22, which is a very small number. This indicates that the concentration of reactants (CO and O2) is much greater than the concentration of products (CO2) at equilibrium.

For part (c), the equilibrium constant K is 1, which means the concentrations of reactants (BrCl) and products (Br2 and Cl2) are equal at equilibrium.

Based on the analysis of the equilibrium constants, the correct answer is: a) products, b) reactants, c) equal.

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Textbook Question

Oxygen can be converted into ozone by the action of lightning or electric sparks:

3 O₂(g) ⇌ 2 O₃(g)

For this reaction, ∆H = +69kcal/mol (+285 kj/mol) and K = 2.68 × 10^-29 at 25 °C.

b. Are the reactants or the products favored at equilibrium?

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Textbook Question

Magnetite, an iron ore with formula Fe₃O₄, can be reduced by treatment with hydrogen to yield iron metal and water vapor.

d. This reaction has K = 2.3 × 10^-18. Are the reactants or the products favored?

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Textbook Question

Ammonia reacts slowly in air to produce nitrogen monoxide and water vapor:

NH₃(g) + O₂(g) ⇌ NO(g) + H₂O(g) + Heat

b. Write the equilibrium equation.

The decomposition of nitrogen monoxide can be achieved under high temperatures to create the products of nitrogen and oxygen gas.

6 NO(aq) ⇌ 3 N₂(aq) + 3 O₂(aq)

a) What is the equilibrium equation for the reaction above?

b) What is the equilibrium expression for the reverse reaction.

The equilibrium constant, K, for 2 NO (g) + O₂ (g) ⇌ 2 NO₂ (g) is 6.9 x 10².

What is the [NO] in an equilibrium mixture of gaseous NO, O₂, and NO₂ at 500 K that contains 1.5 x 10 ^–2 M O₂ and 4.3 x 10 ^–3 M NO₂?

Do the following reactions favor reactants or products at equilibrium? Give relative concentrations at equilibrium.

c. Fe₂O₃(s) + 3 CO(g) ⇌ 2 Fe(s) + 3 CO₂(g) K (at 727 °C) = 24.2

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Textbook Question

Do the following reactions favor reactants or products at equilibrium? Give relative concentrations at equilibrium.

a. Sucrose(aq) + H₂O(l) ⇌ Glucose(aq) + Fructose(aq) K = 1.4 × 10⁵

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Struggling with GOB Chemistry?

State which is greater in amount: reactants or products, based on the given equilibrium constant, K.a) N2 (g) + O2 (g) ⇌ 2 NO (g) K = 1.0 x 1020b) 2 CO (g) + O2 (g) ⇌ 2 CO2 (g) K = 2.2 x 10-22c) 2 BrCl (g) ⇌ Br2 (g) + Cl2 (g) K = 1

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The Equilibrium Constant practice set

State which is greater in amount: reactants or products, based on the given equilibrium constant, K.
a) N₂ (g) + O₂ (g) ⇌ 2 NO (g) K = 1.0 x 10²⁰
b) 2 CO (g) + O₂ (g) ⇌ 2 CO₂ (g) K = 2.2 x 10^-22
c) 2 BrCl (g) ⇌ Br₂ (g) + Cl₂ (g) K = 1