Question

The decomposition of Cl₂O7 at 500 K in the gas phase to Cl₂ and O₂ is a first order reaction. After 1 minute at 500 K, the pressure of Cl₂O₇ falls from 0.08 to 0.04 atm. Calculate the rate constant in s⁻¹.

Answer 1

k = `2.303/"t" log  (["A"_0])/(["A"])`

k = `2.303/(1 "min") log  ([0.08])/([0.04])`

k = 2.303 log 2

k = 2.303 × 0.3010

k = 0.6932 min⁻¹

k = `(0.6932/60) "s"^-1`

k = 1.153 × 10⁻² s⁻¹