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Ch.16 - Chemical Equilibrium
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 6th EditionCh.16 - Chemical EquilibriumProblema 39
Capitolo 16, Problema 39

Consider the reaction: N2(g) + 3 H2(g) ⇌ 2 NH3(g) Complete the table. Assume that all concentrations are equilibrium concentrations in M.
T (K) [N2] [H2] [NH3] Kc
500 0.115 0.105 0.439 _
575 0.110 _ 0.128 9.6
775 0.120 0.140 _ 0.0584

Guida verificata passo dopo passo
1
Identify the balanced chemical equation for the reaction: \( N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \).
Use the equilibrium constant expression for the reaction: \( K_c = \frac{[NH_3]^2}{[N_2][H_2]^3} \).
For the first row (T = 500 K), plug the given concentrations into the equilibrium expression to verify the provided \( K_c \) value.
For the second row (T = 575 K), use the given \([N_2]\), \([NH_3]\), and the calculated \( K_c \) from the first row to solve for the missing \([H_2]\) concentration.
For the third row (T = 775 K), use the given \([N_2]\), \([H_2]\), and the calculated \( K_c \) from the first row to solve for the missing \([NH_3]\) concentration.

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Chemical Equilibrium

Chemical equilibrium occurs when the rates of the forward and reverse reactions are equal, resulting in constant concentrations of reactants and products. In this state, the system is dynamic, meaning that reactions continue to occur, but there is no net change in concentration. Understanding this concept is crucial for analyzing equilibrium constants and predicting how changes in conditions affect the system.
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Chemical Equilibrium Concepts

Equilibrium Constant (Kc)

The equilibrium constant (Kc) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium, each raised to the power of their coefficients in the balanced equation. It provides insight into the position of equilibrium; a larger Kc indicates a greater concentration of products, while a smaller Kc suggests more reactants. Calculating Kc is essential for completing the provided table.
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Equilibrium Constant Expressions

Concentration Units (Molarity)

Molarity (M) is a unit of concentration defined as the number of moles of solute per liter of solution. It is commonly used in chemical equations and equilibrium expressions to quantify the amounts of reactants and products. Understanding how to convert between moles and molarity is vital for accurately filling in the missing values in the equilibrium concentration table.
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Molarity
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Consider the following reaction: H2(g) + I2(g) ⇌ 2 HI(g) Complete the table. Assume that all concentrations are equilibrium concentrations in M.

T (°C) [H2] [I2] [HI] Kc

25 0.0355 0.0388 0.922 _

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Consider the reaction:

2 NO( g) + Br2( g)Δ2 NOBr( g) Kp = 28.4 at 298 K

In a reaction mixture at equilibrium, the partial pressure of NO is 125 torr and that of Br2 is 148 torr. What is the partial pressure of NOBr in this mixture?