The reaction: A(g) + 2B(g) → C(g) + D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are PA = 0.60 atm and PB = 0.80 atm. When PB = 0.20 atm, the rate of reacti

Question

The reaction: A(g) + 2B(g) → C(g) + D(g) is an elementary process. In an experiment, the initial partial pressure of A and B are PA = 0.60 atm and PB = 0.80 atm. When PB = 0.20 atm, the rate of reaction, relative to the initial rate is

Prashant Kotian · Accepted Answer

Correct answer: C. Initial rate R1 = K(0.60)(0.80)^2. Change in PB is 0.60 atm. From stoichiometry, change in PA is 0.60 / 2 = 0.30 atm. Remaining PA = 0.60 - 0.30 = 0.30 atm. New rate R2 = K(0.30)(0.20)^2. Ratio R2/R1 = (0.30/0.60) * (0.20/0.80)^2 = (1/2) * (1/4)^2 = 1/32. Therefore, correct answer is C.

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