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A gaseous reaction A(2)(g) rarr B(g) + (...

A gaseous reaction `A_(2)(g) rarr B(g) + (1)/(2) C(g)` shows increase in pressure form `100 mm` to `120 mm` in `5 min`. What is the rate of disappearance of `A_(2)` ?

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`{:(,A_(2)(g),rarr,B(g)+,(1)/(2)C(g)),("Initial",P,,0,0),("At eq", P-x,,x,(x)/(2)):}`
Total pressure `= P - x + x + (x)/(2) = P+(x)/(2)`
Initial pressure `(P) = 100 mm`
Final pressure `= "Total pressure" = 120 mm`
`:. P + (x)/(2) = 120`
`100 + (x)/(2) = 120`
`x = 40 mm`
`:. (-d[A])/(dt) = (40)/(5) = 8 mm ,min^(-1)`
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