A gaseous `A_(2)(g) rarr B(g) +(1)/(2) C(g)`, shows increase in pressure from 100 mm to 120 mm in 5 min. The rate of disappearance of `A_(2)` is

Options

A. 4 mm `mi n^(-1)`
B. 8 mm `mi n^(-1)`
C. 16 mm `mi n^(-1)`
D. 2 mn `mi n^(-1)`

Explanation

`A_(2(g)) to B (g) + 1/2C(g)`
Initial 100 0 0
Eqm. 100-p p `1/2p`
Total `= 100-p + p + 1/2p = 120 or p = 40mm`
Rate `=(dp_(A_2))/(dt)= 40/5 = 8 m m mi n^(-1)`