In a gaseous phase reaction $A_{2 (g)} \to B_{(g)} + \frac{1}{2} C_{(g)}$ the increase in pressure from 100mm to 120mm is noticed in 5 minute. The average rate of disappearance of A₂ in mm min^–1 is ___

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Detailed Solution

$A_{(g)} \to B_{(g)} + \frac{1}{2} C_{(g)}; 100 - x x x / 2$
After 5 min; $100 - x + x + x / 2 = 120 mm$
$\frac{x}{2} = 20 \Rightarrow x = 40 mm$
A disappeared is 40 mm
$∴ Rate = \frac{40}{5} = 8 mm / \min$

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