The equilibrium constant Kc for the reaction PCl3(g) + Cl2(g) PCl5(g) Is 49 at 230°C. If 0.70 mol of PCl3 is added to 0.70 mol of Cl2 in a 1.00-L reaction vessel at 230°C, what is the concentration of PCl3 when equilibrium has been established?

A) 0.049 M B) 0.11 M C) 0.30 M D) 0.59 M E) 0.83 M A) 0.049 M B) 0.11 M C) 0.30 M D) 0.59 M E) 0.83 M

The following reaction is at equilibrium at a pressure of 1 atm, in a closed container. NaOH(s) + CO2(g) NaHCO3(s) F1F1F1S1F1F1F10H°rxn 2 gas present at equilibrium?

A) adding N2 gas to double the pressure B) adding more solid NaOH C) increasing the volume of the container D) lowering the temperature E) none of the above A) adding N2 gas to double the pressure B) adding more solid NaOH C) increasing the volume of the container D) lowering the temperature E) none of the above

Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C17H35COOH (C17H35COOH)2 F1F1F1S1F1F1F10H°rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C.

A) 4.7 × 105 B) 2.6 × 104 C) 1.9 × 103 D) 3.2 × 102 E) 18 A) 4.7 × 105 B) 2.6 × 104 C) 1.9 × 103 D) 3.2 × 102 E) 18

Exam 17: Equilibrium: the Extent of Chemical Reactions

Ammonia is synthesized in the Haber process: N₂(g) + 3H₂(g) 2NH₃(g) K_p for this reaction is 1.49 × 10^-5at 500.°C. Calculate K_c at this temperature.

(Short Answer)

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Question 41

If Q > K, more products need to be formed as the reaction proceeds to equilibrium.

(True/False)

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Question 42

What is the mass-action expression, Q_p, for the following reaction? SbF₅(g) + 4Cl₂(g) SbCl₃(g) + 5ClF(g)

(Multiple Choice)

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Question 43

The equilibrium constant K_c for the reaction PCl₃(g) + Cl₂(g) PCl₅(g) Is 49 at 230°C. If 0.70 mol of PCl₃is added to 0.70 mol of Cl₂in a 1.00-L reaction vessel at 230°C, what is the concentration of PCl₃when equilibrium has been established?

(Multiple Choice)

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Question 44

Nitric oxide and bromine were allowed to react in a sealed container. When equilibrium was reached P_NO = 0.526 atm, = 1.59 atm, and P_NOBr = 7.68 atm. Calculate K_p for the reaction. 2NO(g) + Br₂(g) 2NOBr(g)

(Multiple Choice)

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Question 45

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant K_c will also increase.

(True/False)

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Question 46

Sodium hydrogen carbonate decomposes above 110°C to form sodium carbonate, water, and carbon dioxide. 2NaHCO₃(s) Na₂CO₃(s) + H₂O(g) + CO₂(g) One thousand grams of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens in this system if another 50 g of sodium carbonate are now added?

(Multiple Choice)

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Question 47

Carbon monoxide and chlorine combine in an equilibrium reaction to produce the highly toxic product, phosgene (COCl₂) CO(g) + Cl₂(g) COCl₂(g) If the equilibrium constant for this reaction is K_c = 248, predict, if possible, what will happen when the reactants and product are combined with the concentrations shown. [CO] = [Cl₂] = 0.010 M; [COCl₂] = 0.070 M

(Multiple Choice)

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Question 48

Write the mass-action expression, Q_c, for the following chemical reaction equation. 2C₆H₆(g) + 15O₂(g) 12CO₂(g) + 6H₂O(g)

(Multiple Choice)

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Question 49

At high temperatures, carbon reacts with O₂ to produce CO as follows: C(s) + O₂(g) 2CO(g). When 0.350 mol of O₂ and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, K_c, for this reaction?

(Multiple Choice)

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Question 50

The reaction system CS₂(g) + 4H₂(g) CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of hydrogen is doubled?

(Multiple Choice)

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Question 51

The following reaction is at equilibrium at a pressure of 1 atm, in a closed container. NaOH(s) + CO₂(g) NaHCO₃(s) H°_rxn < 0 Which, if any, of the following actions will decrease the concentration of CO₂ gas present at equilibrium?

(Multiple Choice)

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Question 52

Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C₁₇H₃₅COOH (C₁₇H₃₅COOH)₂H°_rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C.

(Multiple Choice)

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Question 53

Write the mass-action expression, Q_c, for the following chemical reaction. Zn(s) + 2Ag⁺(aq) Zn²⁺(aq) + 2Ag(s)

(Multiple Choice)

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Question 54

A good catalyst for a reaction will speed up the forward reaction and slow down the reverse reaction.

(True/False)

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Question 55

The following reaction, in CCl₄ solvent, has been studied at 25°C. 2BrCl Br₂ + Cl₂ The equilibrium constant K_c is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

(Multiple Choice)

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Question 56

Hydrogen iodide, HI, is formed in an equilibrium reaction when gaseous hydrogen and iodine gas are heated together. If 20.0 g of hydrogen and 20.0 g of iodine are heated, forming 10.0 g of hydrogen iodide, what mass of hydrogen remains unreacted?

(Multiple Choice)

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Question 57

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) X₂(g) + Y₂(g) XY(g) (2) 2XY(g) X₂(g) + Y₂(g)

(Multiple Choice)

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Question 58

SO₂ reacts with O₂ to produce SO₃. If 86.0 g of SO₂ is placed in a reaction vessel along with excess oxygen gas, how many moles of SO₂ remain when 50.0 g of SO₃ have been formed?

(Multiple Choice)

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Question 59

At 450°C, tert-butyl alcohol decomposes into water and isobutene. (CH₃)₃COH(g) (CH₃)₂CCH₂(g) + H₂O(g) A reaction vessel contains these compounds at equilibrium. What will happen if the volume of the container is reduced by 50% at constant temperature?

(Multiple Choice)

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Question 60

Showing 41 - 60 of 104

Exam 17: Equilibrium: the Extent of Chemical Reactions

Ammonia is synthesized in the Haber process: N2(g) + 3H2(g) 2NH3(g) Kp for this reaction is 1.49 × 10-5 at 500.°C. Calculate Kc at this temperature.

If Q > K, more products need to be formed as the reaction proceeds to equilibrium.

What is the mass-action expression, Qp, for the following reaction? SbF5(g) + 4Cl2(g) SbCl3(g) + 5ClF(g)

The equilibrium constant Kc for the reaction PCl3(g) + Cl2(g) PCl5(g) Is 49 at 230°C. If 0.70 mol of PCl3 is added to 0.70 mol of Cl2 in a 1.00-L reaction vessel at 230°C, what is the concentration of PCl3 when equilibrium has been established?

Nitric oxide and bromine were allowed to react in a sealed container. When equilibrium was reached PNO = 0.526 atm, = 1.59 atm, and PNOBr = 7.68 atm. Calculate Kp for the reaction. 2NO(g) + Br2(g) 2NOBr(g)

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant Kc will also increase.

Write the mass-action expression, Qc, for the following chemical reaction equation. 2C6H6(g) + 15O2(g) 12CO2(g) + 6H2O(g)

At high temperatures, carbon reacts with O2 to produce CO as follows: C(s) + O2(g) 2CO(g). When 0.350 mol of O2 and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, Kc, for this reaction?

The reaction system CS2(g) + 4H2(g) CH4(g) + 2H2S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of hydrogen is doubled?

The following reaction is at equilibrium at a pressure of 1 atm, in a closed container. NaOH(s) + CO2(g) NaHCO3(s) H°rxn < 0 Which, if any, of the following actions will decrease the concentration of CO2 gas present at equilibrium?

Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C17H35COOH (C17H35COOH)2 H°rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C.

Write the mass-action expression, Qc , for the following chemical reaction. Zn(s) + 2Ag+(aq) Zn2+(aq) + 2Ag(s)

A good catalyst for a reaction will speed up the forward reaction and slow down the reverse reaction.

The following reaction, in CCl4 solvent, has been studied at 25°C. 2BrCl Br2 + Cl2 The equilibrium constant Kc is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

Hydrogen iodide, HI, is formed in an equilibrium reaction when gaseous hydrogen and iodine gas are heated together. If 20.0 g of hydrogen and 20.0 g of iodine are heated, forming 10.0 g of hydrogen iodide, what mass of hydrogen remains unreacted?

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) X2(g) + Y2(g) XY(g) (2) 2XY(g) X2(g) + Y2(g)

SO2 reacts with O2 to produce SO3. If 86.0 g of SO2 is placed in a reaction vessel along with excess oxygen gas, how many moles of SO2 remain when 50.0 g of SO3 have been formed?

At 450°C, tert-butyl alcohol decomposes into water and isobutene. (CH3)3COH(g) (CH3)2CCH2(g) + H2O(g) A reaction vessel contains these compounds at equilibrium. What will happen if the volume of the container is reduced by 50% at constant temperature?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Ammonia is synthesized in the Haber process: N₂(g) + 3H₂(g) 2NH₃(g) K_p for this reaction is 1.49 × 10^-5at 500.°C. Calculate K_c at this temperature.

What is the mass-action expression, Q_p, for the following reaction? SbF₅(g) + 4Cl₂(g) SbCl₃(g) + 5ClF(g)

The equilibrium constant K_c for the reaction PCl₃(g) + Cl₂(g) PCl₅(g) Is 49 at 230°C. If 0.70 mol of PCl₃is added to 0.70 mol of Cl₂in a 1.00-L reaction vessel at 230°C, what is the concentration of PCl₃when equilibrium has been established?

Nitric oxide and bromine were allowed to react in a sealed container. When equilibrium was reached P_NO = 0.526 atm, = 1.59 atm, and P_NOBr = 7.68 atm. Calculate K_p for the reaction. 2NO(g) + Br₂(g) 2NOBr(g)

In a chemical reaction, if the starting concentrations of reactants are increased, then the equilibrium constant K_c will also increase.

Write the mass-action expression, Q_c, for the following chemical reaction equation. 2C₆H₆(g) + 15O₂(g) 12CO₂(g) + 6H₂O(g)

The reaction system CS₂(g) + 4H₂(g) CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of hydrogen is doubled?

The following reaction is at equilibrium at a pressure of 1 atm, in a closed container. NaOH(s) + CO₂(g) NaHCO₃(s) H°_rxn < 0 Which, if any, of the following actions will decrease the concentration of CO₂ gas present at equilibrium?

Stearic acid, nature's most common fatty acid, dimerizes when dissolved in hexane: 2C₁₇H₃₅COOH (C₁₇H₃₅COOH)₂H°_rxn = -172 kJ The equilibrium constant for this reaction at 28°C is 2900. Estimate the equilibrium constant at 38°C.

Write the mass-action expression, Q_c, for the following chemical reaction. Zn(s) + 2Ag⁺(aq) Zn²⁺(aq) + 2Ag(s)

The following reaction, in CCl₄ solvent, has been studied at 25°C. 2BrCl Br₂ + Cl₂ The equilibrium constant K_c is known to be 0.141. If the initial concentration of chlorine is 0.0300 M and of bromine monochloride is 0.0200 M, what is the equilibrium concentration of bromine?

The equilibrium constant for reaction (1) below is 276. Under the same conditions, what is the equilibrium constant of reaction (2)? (1) X₂(g) + Y₂(g) XY(g) (2) 2XY(g) X₂(g) + Y₂(g)

SO₂ reacts with O₂ to produce SO₃. If 86.0 g of SO₂ is placed in a reaction vessel along with excess oxygen gas, how many moles of SO₂ remain when 50.0 g of SO₃ have been formed?

At 450°C, tert-butyl alcohol decomposes into water and isobutene. (CH₃)₃COH(g) (CH₃)₂CCH₂(g) + H₂O(g) A reaction vessel contains these compounds at equilibrium. What will happen if the volume of the container is reduced by 50% at constant temperature?