When S in the form of S₈ is heated at 900 K, the initial pressure of 1 atm falls by 30% at equilibri — Chemical Equilibrium Chemistry Question
Question
When S in the form of S₈ is heated at 900 K, the initial pressure of 1 atm falls by 30% at equilibrium. This is because of conversion of some S₈(g) to S₂(g). The K_p of the reaction is
Answer: B
💡 Solution & Explanation
The phrase "initial pressure of 1 atm falls by 30%" refers to the partial pressure of S₈ decreasing by 30%. Thus, p_reacted = 0.3 atm. Eq pressure of S₈ = 0.7 atm. The reaction is S₈(g) ⇌ 4S₂(g), so P_S₂ = 4 × 0.3 = 1.2 atm. K_p = (1.2)⁴ / 0.7 = 2.0736 / 0.7 ≈ 2.96 atm³. Therefore, correct answer is B.
💬Ask on WhatsApp →
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp — gets answered in minutes