Equilibrium constants Kc and Kp Quiz
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5 questions, one answer each
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1. Which is the Kc expression for H₂(g) + I₂(g) ⇌ 2HI(g)?
- A. [H₂][I₂] / [HI]²
- B. [HI] / ([H₂][I₂])
- C. [HI]² / ([H₂][I₂])
- D. 2[HI] / ([H₂][I₂])
2. What are the units of Kp for N₂(g) + 3H₂(g) ⇌ 2NH₃(g) with pressures in atm?
- A. atm⁻²
- B. atm²
- C. atm
- D. no units
3. Which is the Kp expression for CaCO₃(s) ⇌ CaO(s) + CO₂(g)?
- A. p(CaO) p(CO₂) / p(CaCO₃)
- B. p(CO₂) / p(CaCO₃)
- C. p(CaO) / p(CO₂)
- D. p(CO₂)
4. At equilibrium, PCl₅ ⇌ PCl₃ + Cl₂ has [PCl₅] = 0.20, [PCl₃] = 0.10 and [Cl₂] = 0.10 mol dm⁻³. What is Kc?
- A. 0.50 mol dm⁻³
- B. 0.050 mol dm⁻³
- C. 20 mol dm⁻³
- D. 0.050
5. A gas mixture is 25% by moles in gas X at a total pressure of 4.0 atm. What is p(X)?
- A. 0.25 atm
- B. 4.0 atm
- C. 1.0 atm
- D. 16 atm