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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 39
15장, 문제 39

Two different proteins X and Y are dissolved in aqueous solution at 37 _x001F_C. The proteins bind in a 1:1 ratio to form XY. A solution that is initially 1.00 mM in each protein is allowed to reach equilibrium. At equilibrium, 0.20 mM of free X and 0.20 mM of free Y remain. What is Kc for the reaction?

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1
Identify the initial concentrations of proteins X and Y, which are both 1.00 mM.
Determine the change in concentration for proteins X and Y as they form the complex XY. Since 0.20 mM of each remains, 0.80 mM of each has reacted to form XY.
Calculate the equilibrium concentration of the complex XY. Since the proteins bind in a 1:1 ratio, the concentration of XY formed is also 0.80 mM.
Write the expression for the equilibrium constant Kc for the reaction: \( K_c = \frac{[XY]}{[X][Y]} \).
Substitute the equilibrium concentrations into the Kc expression: \( K_c = \frac{0.80}{0.20 \times 0.20} \).

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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 reversible chemical reaction. It is calculated using the formula Kc = [products]/[reactants], where the concentrations are raised to the power of their coefficients in the balanced equation. A higher Kc value indicates a greater extent of reaction towards products.
추천 영상:
가이드 코스
03:20
Equilibrium Constant Expressions

Molarity and Concentration

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution (mol/L). In this context, the initial concentrations of proteins X and Y are given as 1.00 mM, which means there are 1.00 millimoles of each protein in one liter of solution. Understanding how to convert between moles and molarity is essential for calculating equilibrium concentrations.
추천 영상:
가이드 코스
00:53
Molarity Concept

Stoichiometry of the Reaction

Stoichiometry involves the quantitative relationships between the reactants and products in a chemical reaction. In this case, the proteins X and Y bind in a 1:1 ratio to form the complex XY. Knowing the initial concentrations and the changes at equilibrium allows us to set up an expression to find the equilibrium concentrations of all species involved, which is crucial for calculating Kc.
추천 영상:
가이드 코스
01:16
Stoichiometry Concept
관련 실천
교과서 질문

Indicate whether each of the following statements about the reaction quotient Q is true or false: (b) If 𝑄𝑐 < 𝐾𝑐, the reaction needs to proceed to the right to reach equilibrium.

교과서 질문

Indicate whether each of the following statements about the reaction quotient Q is true or false: (a) The expression for 𝑄𝑐 looks the same as the expression for 𝐾𝑐.

교과서 질문

At 100°C, the equilibrium constant for the reaction COCl2(𝑔) ⇌ CO(𝑔) + Cl2(𝑔) has the value 𝐾𝑐 = 2.19×10−10. Are the following mixtures of COCl2, CO, and Cl2 at 100°C at equilibrium? If not, indicate the direction that the reaction must proceed to achieve equilibrium.

(a) [COCl2] = 2.00×10−3 M, [CO] = 3.3×10−6 M, [Cl2] = 6.62×10−6 M

(b) [COCl2] = 4.50×10−2 M, [CO] = 1.1×10−7 M, [Cl2] = 2.25×10−6 M

(c) [COCl2] = 0.0100 M, [CO] = [Cl2] = 1.48×10−6 M

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교과서 질문

A mixture of 0.2000 mol of CO2, 0.1000 mol of H2, and 0.1600 mol of H2O is placed in a 2.000-L vessel. The following equilibrium is established at 500 K: CO2(g) + H2(g) ⇌ CO(g) + H2O(g) (d) Calculate Kc for the reaction.

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