For the reaction: A2(g) - B(g) + 1/2 C(g), pressure of the system increases from 100 to 120 mm in 5 min. The average rate of disappearance of A2 (in mm/min) in this time interval is

Question

For the reaction: A2(g) -> B(g) + 1/2 C(g), pressure of the system increases from 100 to 120 mm in 5 min. The average rate of disappearance of A2 (in mm/min) in this time interval is

Prashant Kotian · Accepted Answer

Correct answer: B. Let initial pressure of A2 be 100 mm. After 5 min: A2 -> B + 0.5 C. Pressure of A2 = 100 - x; Pressure of B = x; Pressure of C = 0.5 x. Total pressure = 100 - x + x + 0.5 x = 100 + 0.5 x = 120 mm => 0.5 x = 20 => x = 40 mm. Average rate of disappearance of A2 = x / t = 40 mm / 5 min = 8 mm/min.

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