The decomposition of a gas follows first-order kinetics with an initial pressure of 0.8 atm. After 100 s, the total pres
x = 0.4, pA = 0.4. k ≈ 6.93 × 10⁻³ s⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - Zero Order Reactions