COMEDK2024ChemistryChemical EquilibriumActual
S ₈ on heating at a temperature above 1000 K, changes to S ₂(g) . When S ₈ is heated above 1000 K at an initial pressure of 1 atm, the partial pressure of S ₈ falls by 32% at equilibrium. The equilibrium constant for the conversion is:
Options
- A2.55 ~atm ^3
- B3.94 ~atm ^3
- C3.20 ~atm ^3
- D4.50 ~atm ^3
Correct answer
B. 3.94 ~atm ^3
Step-by-step solution
S₈(g) 4S₂(g) Initial pressure of S₈ = 1 atm. Pressure falls by 32%: P_ S₈ = 1 - 0.32 = 0.68 atm P_ S₂ = 4 0.32 = 1.28 atm K_p = (P_ S₂ )^4 P_ S₈ = (1.28)^4 0.68 = 2.684 0.68 3.94 atm ^3