Practice question
Question
A first-order gaseous reaction has an initial pressure of 2.0 atm. After 20 s, the total pressure is 2.5 atm. What is the rate constant?
Explanation
For A → B + C, x = 0.5 atm, pA = 1.5 atm. k = (2.303/20) log(2.0/1.5) ≈ 0.0203 s⁻¹.
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