16. Chemical Equilibrium

Which statement best describes the condition of a chemical system at equilibrium?

Consider the following reaction: CO(g) + 2H2(g) ⇌ CH3OH(g). The reaction between CO and H2 is carried out at a specific temperature with initial concentrations of CO = 0.31 M and H2 = 0.55 M. At equilibrium, the concentration of CH3OH is found to be 0.10 M. What is the equilibrium concentration of CO?

Consider the reaction A(aq) ⇌ B(aq) in an equilibrium state where KC < 1. The rate of the reaction A(aq) → B(aq) at equilibrium is 59.9 mol/s. What is the rate of the reaction B(aq) → A(aq) at equilibrium?

Consider the reaction A(aq) ⇌ B(aq) in an equilibrium state where K_C < 1. If the rate of the forward reaction A(aq) ⇌ B(aq) at equilibrium is 59.9 mol/s, what is the rate of the reverse reaction B(aq) ⇌ A(aq) at equilibrium?

Cyclohexane, C6H12, undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane, CH3C5H9, according to the equation: C6H12 ⇌ CH3C5H9. If Kc = 0.143 at 25°C for this reaction, what is the equilibrium concentration ratio of CH3C5H9 to C6H12?

For the isomerization reaction butane ↔ isobutane, Kp equals 25 at 500°C. If the initial pressures of butane and isobutane are 10.0 atm and 0.0 atm, respectively, what are the pressures of the two gases at equilibrium?

Gaseous hydrogen bromide decomposes at elevated temperatures according to the following equation: 2 HBr(g) ⇌ H2(g) + Br2(g). At a certain temperature, a 2.00 L flask is initially filled only with 0.600 mol of HBr. If the equilibrium concentration of H2 is 0.100 M, what is the value of Kc at that temperature?

Given the following reaction at equilibrium at 450.0 °C: CaCO3 (s) ⇌ CaO (s) + CO2 (g). If pCO2 = 0.0160 atm, what is the Kc value?

In the reaction C(s) + CO2(g) ⇌ 2CO(g), if the initial pressure of CO2 is 0.800 atm and the equilibrium pressure of CO is 1.10 atm, what is the equilibrium pressure of CO2?

The equilibrium constant, Kp, equals 3.40 at 25°C for the isomerization reaction: cis-2-butene ⇌ trans-2-butene. If a flask initially contains 1.00 atm of each gas, in what direction will the system shift to reach equilibrium?

For the isomerization reaction cis-2-butene ⇌ trans-2-butene with an equilibrium constant Kp of 3.40, if a flask initially contains 0.250 atm of cis-2-butene and 0.165 atm of trans-2-butene, what is the equilibrium pressure of cis-2-butene?

For the isomerization reaction cis-2-butene ⇌ trans-2-butene with an equilibrium constant Kp of 3.40, if a flask initially contains 0.250 atm of cis-2-butene and 0.165 atm of trans-2-butene, what is the equilibrium pressure of cis-2-butene?

The following picture represents the equilibrium state for the reaction A2 + B2 ⇌ 2AB (A = white; B = gray). What is the relationship between the rate constant for the forward reaction, kf, and the rate constant for the reverse reaction kr at equilibrium?

The following two isomers of C3H7NO exist in equilibrium with each other in solution: If K_c = 0.57 at 25°C and the initial concentration of the reactant is 0.50 M and the product is 0.70 M, what are the concentrations of the reactant and product at equilibrium?

The following two isomers of C3H7NO exist in equilibrium with each other in solution: If Kc = 0.57 at 25°C and the initial concentration of the reactant is 0.50 M and the product is 0.70 M, what is the concentration of the reactant at equilibrium?