Chloroethane decomposes at elevated temperatures according to the reaction
C₂H₅Cl(g) → C₂H₄(g) + HCl(g)
The reaction obeys first order kinetics. After 340 seconds at 800 K, a measurement shows that the concentration of C₂H₅Cl decreased from 0.0098 mol·L^-¹to 0.0016 mol·L^-¹. What is the value of the rate constant at 800 K?

Question

Quizplus · Accepted Answer

For a first-order reaction, the rate constant k can be calculated using the formula: k = (1/t) * ln([A]₀/[A]), where [A]₀ is the initial concentration, [A] is the final concentration, and t is the time. Substituting the given values: k = (1/340 s) * ln(0.0098/0.0016) = 2.3×10⁻³ s⁻¹.

Chloroethane Decomposes at Elevated Temperatures According to the Reaction