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)` ?

Options

A. 4
B. 8
C. 16
D. 2

Answer

A

Explanation

`{:(,A_2(g)to,B(g)+,1/2C(g)),(t=0,100,0,0),(t=5,100-p,p,p//2),("At" "t"=5 "min",,underset(p=20)(100+p//2=110),):}`
rate of disappearence of `A_2=20/5=4`