A gaseous reaction X2 (g)→ Yg+12Z(g) There is increase in pressure from 100 mm of Hg to 120 mm of Hg in 5 minutes. The rate of disappearance of X2 in mm of Hg per minutes is ______

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A gaseous reaction $X_{2}_{(g)} \to Y_{(g)} + \frac{1}{2} Z_{(g)}$

There is increase in pressure from 100 mm of Hg to 120 mm of Hg in 5 minutes. The rate of disappearance of $X_{2}$ in mm of Hg per minutes is _______

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answer is A.

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Detailed Solution

Let gaseous reaction be,

$X_{2}_{(g)} \overset{}{\to} Y_{(g)} + \frac{1}{2} Z_{(g)}$

100 0 0

(100-x) x $\frac{x}{2}$

=60

(100-x+x+ $\frac{x}{2}$ )=120

x=40

$r = \frac{- ∆ p}{∆ t} = \frac{- (60 - 100)}{5} = 8 mm of Hg / \min$

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