At 300 K, a gaseous reaction: A arrow B + C was found to follow first order kinetics. Starting with pure A, the total pressure at the end of 20 minutes was 100 mm of Hg. The total pressure after the completion of the reaction is 180 mm of Hg. The partial pressure of A (in mm of Hg) is

Question

At 300 K, a gaseous reaction: A arrow B + C was found to follow first order kinetics. Starting with pure A, the total pressure at the end of 20 minutes was 100 mm of Hg. The total pressure after the completion of the reaction is 180 mm of Hg. The partial pressure of A (in mm of Hg) is (A) 100 (B) 90 (C) 180 (D) 80

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<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/7454b297023735364a6378dfa5724ad3-.png" /> At the end of the reaction, A completely converted into products, so the pressure of the products after completion of the reaction =pi Partial pressure of A, pA=pi-x =(180-100) atm =80 atm

Q. At 300K, a gaseous reaction: A→B+C was found to follow first order kinetics. Starting with pure A, the total pressure at the end of 20 minutes was 100mmofHg. The total pressure after the completion of the reaction is 180mmofHg. The partial pressure of A(inmmofHg) is

100

90

180

80

At the end of the reaction, A completely converted into products, so the pressure of the products after completion of the reaction =pi​ Partial pressure of A, pA​=pi​−x =(180−100)atm =80atm

At the end of the reaction, $A$ completely converted into products, so the pressure of the products after completion of the reaction $= p_{i}$ Partial pressure of $A$ ,

$p_{A} = p_{i} - x$

$= (180 - 100) a t m$

$= 80 a t m$