Equilibrium between dinitrogen tetroxide-nitrogen dioxide

Question

Assignment:

Q1. 4CuO(s) + CH₄(g) CO₂(g) + 4Cu(s) + 2H₂O(g) The value of K_c for this reaction is 1.10 at 25.0°C. What is the value of K_p for this reaction? (R = 0.0821 L-atm/K-mol)
a. 4.63
b. 26.9
c. 658
d. 37.2
e. 1.52 x 10^-3

Q2. At a certain temperature, a flask at equilibrium contains 0.0551 M HCl, 0.112 M Cl₂, and 0.105 M H₂. What is the value of K_c for the equilibrium: 2 HCl(g)→ Cl₂(g) + H₂(g)?

a. 3.87
b. 0.258
c. 11.0
d. 1.63 x 10-5
e. 0.213

Q3. Consider the following incomplete table of data for the equilibrium between dinitrogen tetroxide and nitrogen dioxide.

Exp # Equilibrium N2O4 Concentr Equilibrium NO2 Concentration
1 0.00140 M 0.0172 M
2 0.00452 ?
3 0.00280 0.0243

From the information in the table, determine the value of the missing NO₂ concentration at equilibrium.

a. 0.0309
b. 0.0486
c. 9.54 x 10^-4
d. 0.115
e. 0.0814

Q4. Consider the gaseous equilibrium: 2 A → 2 B + C Determine the value of the missing B concentration at equilibrium.

Exp# [A] at equilibrium [B] at equilibrium [C] at equilibrium
1 0.10 M 0.15 M 0.20 M
2 0.20 0.50 0.072
3 0.35 ? 0.15

a. 0.20
b. 0.35
c. 0.61
d. 0.40
e. 0.37

Q5. The expression for Kc for the reaction below is _______________.

NiCO₃(s) + 2H+(aq) Ni²⁺(aq) + CO₂(g) + H₂O(l)

a. [CO₂]
b. [NiCO₃]/[Ni²⁺]
c. [Ni²⁺][CO₂]/[H⁺]₂
d. [Ni²⁺][H⁺]2
e. [Ni²⁺]/[NiCO₃]

Q6. Consider the following chemical reaction:
H₂(g) + I₂(g) 2HI(g)
At equilibrium, the concentrations of H2, I2, and HI were 0.15 M, 0.033 M, and 0.55 M, respectively. The value of Kc for this reaction is
111
9.0 x 10^-3
6.1
23
61

Q7. Consider the following reaction:

PCl₅(g) PCl₃(g) + Cl₂(g)

Initially, 0.84 mol of PCl₅(g) was placed in a 1.0 L flask. At equilibrium, 0.72 mol of PCl₅(g) was present. The value of K_c for this reaction at this temperature is ___________.

a. 2.0 x 10^-2
b. 0.62
c. 0.60
d. 0.12
e. 0.72

Q8. The value of K_c for the reaction below is 0.016. Under a set of equilibrium conditions, [HI] = 0.10 M and [H₂] = [I₂]. Calculate the concentration of I₂ (M).

2HI(g) H₂(g) + I₂(g)

a. 1.3 M
b. 3.1 x 10^-1
c. 0.31
d. 4.0 x 10^-2
e. 1.3 x 10^-2