Write the equilibrium constant expression for the following reaction:
CH₄ (g) + 2 H₂S (g) ⇆ CS₂ (g) + 4 H₂ (g)

In which of the given reactants is K_p greater than, less than and equal to K_c?

a) SO₃ (g) + NO (g) ⇌ SO₂ (g) + NO₂ (g)

b) P₄ (s) + 5 O₄ (g) ⇌ P₄O₁₀ (s)

c) 4 NH₃ (g) + 3 O₂ (g) ⇌ 2 N₂ (g) + 6 H₂O (g)

Given the hypothetical reaction 2 A (s) + ? B (g) ⇌ 3 C (g), Kp = 0.0105 and Kc = 0.45 at 250 degrees Celsius. What is the value of the coefficient of B? 

Methane (CH₄) reacts with hydrogen sulfide to yield hydrogen gas and carbon disulfide, a solvent used in the manufacturing rayon and cellophane. What is the value of K_c at 1000 K if the partial pressures in an equilibrium mixture at 1000 K are 0.20 atm methane, 0.15 atm hydrogen sulfide, 0.30 atm carbon disulfide and 0.10 atm hydrogen gas? 

CH₄ (g) + 2 H₂S (g) ⇌ 4 H₂ (g) + CS₂ (g)

Which of the following does not represent a heterogenous equilibrium?  

I) CH₄(g) + 2 O₂(g) ⇌ CO₂(g) + 2 H₂O(g)                  
II) CO₂(g) + C(s) ⇌ 2 CO(g)
III) 2 H₂O(l) ⇌ 2 H₂(g) + O₂(g)
IV) CH₃COOH(aq) + H₂O(l) ⇌ CH₃COO^–(aq) + H₃O⁺(aq)