For the reaction I₂(s)+ Cl₂(g)→ 2 ICl(g),Δ_rH = 36 kJ/mol,and Δ_rS = 158.8 J/mol K at 25 °C.Calculate the temperature at which K_eq is 4.0 × 10³. A)128 °C B)-115 °C C)83 °C D)25 °C E)-175 °C

Question

Quizplus · Accepted Answer

The reaction is exothermic (ΔrH < 0) and the entropy change is positive (ΔrS > 0). According to the van't Hoff equation, lnK = -ΔrH/RT + ΔrS/R, the equilibrium constant K will increase with increasing temperature. Therefore, the temperature at which K = 4.0 × 10^3 must be higher than 25 °C.

For the Reaction I2(s)+ Cl2(g)→ 2 ICl(g),ΔrH = 36 KJ/mol,and

For the Reaction I₂(s)+ Cl₂(g)→ 2 ICl(g),Δ_rH = 36 KJ/mol,and