Skip to main content
Ch.15 - Chemical Equilibrium
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 15th EditionCh.15 - Chemical EquilibriumProblema 55
Capitolo 15, Problema 55

At 2000°C, the equilibrium constant for the reaction 2 NO(𝑔) ⇌ N2(𝑔) + O2(𝑔) is 𝐾𝑐 = 2.4×103. If the initial concentration of NO is 0.175 M, what are the equilibrium concentrations of NO, N2, and O2?

Guida verificata passo dopo passo
1
Write the balanced chemical equation: 2 \(\text{NO}\)(g) \(\rightleftharpoons\) \(\text{N}\)_2(g) + \(\text{O}\)_2(g).
Set up an ICE (Initial, Change, Equilibrium) table to track the concentrations of each species. Initially, [NO] = 0.175 \(\text{ M}\), and [N_2] = [O_2] = 0 \(\text{ M}\).
Define the change in concentration for NO as -2x, for N_2 as +x, and for O_2 as +x, where x is the change in concentration at equilibrium.
Express the equilibrium concentrations in terms of x: [NO] = 0.175 - 2x, [N_2] = x, [O_2] = x.
Substitute these expressions into the equilibrium constant expression: K_c = \(\frac{[N_2][O_2]}{[NO]^2}\) = \(\frac{x \cdot x}{(0.175 - 2x)^2}\) = 2.4 \(\times\) 10^3, and solve for x.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
5m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Equilibrium Constant (Kc)

The equilibrium constant (Kc) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given reaction at a specific temperature. For the reaction 2 NO(g) ⇌ N2(g) + O2(g), Kc = [N2][O2]/[NO]^2. A larger Kc value indicates that products are favored at equilibrium, while a smaller Kc suggests that reactants are favored.
Video consigliato:
Percorso guidato
03:20
Equilibrium Constant Expressions

ICE Table

An ICE table (Initial, Change, Equilibrium) is a tool used to organize the concentrations of reactants and products in a chemical reaction at different stages. It helps in calculating the changes in concentration as the system reaches equilibrium. By filling in the initial concentrations, the changes that occur, and the equilibrium concentrations, one can systematically determine the equilibrium state of the reaction.
Video consigliato:
Percorso guidato
01:14
ICE Charts and Equilibrium Amount

Stoichiometry

Stoichiometry involves the quantitative relationships between the amounts of reactants and products in a chemical reaction, based on the balanced chemical equation. In the reaction 2 NO(g) ⇌ N2(g) + O2(g), stoichiometry allows us to relate the change in concentration of NO to the formation of N2 and O2, using the coefficients from the balanced equation to determine how much of each species is present at equilibrium.
Video consigliato:
Percorso guidato
01:16
Stoichiometry Concept
Pratica correlata
Domanda del libro di testo

For the equilibrium Br2(𝑔) + Cl2(𝑔) ⇌ 2 BrCl(𝑔) at 400 K, 𝐾𝑐 = 7.0. If 0.25 mol of Br2 and 0.55 mol of Cl2 are introduced into a 3.0-L container at 400 K, what will be the equilibrium concentrations of Br2, Cl2, and BrCl?

1290
views
1
rank
Domanda del libro di testo

At 373 K, 𝐾𝑝 = 0.416 for the equilibrium 2 NOBr(𝑔) ⇌ 2 NO(𝑔) + Br2(𝑔) If the equilibrium partial pressures of NOBr(𝑔) and Br2(𝑔) are both 0.100 atm at 373 K, what is the equilibrium partial pressure of NO(𝑔)?

Domanda del libro di testo

At 80°C, 𝐾𝑐 = 1.87×10−3 for the reaction PH3BCl3(𝑠) ⇌ PH3(𝑔) + BCl3(𝑔) (a) Calculate the equilibrium concentrations of PH3 and BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel at 80°C and decomposes until equilibrium is reached. (b) If the flask has a volume of 0.250 L, what is the minimum mass of PH3BCl3(𝑠) that must be added to the flask to achieve equilibrium?

302
views
1
rank
Domanda del libro di testo

At 25°C, the reaction CaCrO4(𝑠) ⇌ Ca2+(𝑎𝑞) + CrO42−(𝑎𝑞) has an equilibrium constant 𝐾𝑐 = 7.1×10−4. What are the equilibrium concentrations of Ca2+ and CrO42− in a saturated solution of CaCrO4?

398
views