The rate constant for the first-order decomposition of a compound A in the reaction 2 A→ P is kr = 3.56 × 10−7 s−1 at 25 °C. What is the half-life of A? If the initial partial pressure of A is 33.0 kPa, what will be its partial pressure (i) 50 s, (ii) 20 min after initiation of the reaction?

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