1.

For the first order reaction, A(g) to B(g) + C(g) + D(s) taking place at constant pressure and temperature condition. Initially, volume of the container containing only A, was found to be 100 l and after time 13.86 minute. it was 150 l. Rateconstant for the reaction is (Use ln 2 = 0.693).

Answer»

`5xx10^(-2) "min"^(-1)`
`2xx10^(-2) sec^(-1)`
`5xx10^(-2) sec^(-1)`
`4xx10^(-2) sec^(-1)`

Solution :`A(g) to B(g) + C(g) + D(s)`
`{:(t=0,, a,-,-,-),(t ,,(a-x),x,x,-):}`
`PV = nRT`
`V prop n` (at const. P & T)
`V_(0) prop a`
`V_(t) prop (a+x)`
`implies x prop (v_(t)-v_(0))`
`K = 1/t 1n(V_0)/(2V_(0)-V_(t))`
`=2/(13.86) 1n 100/(200-150)`
`=1/20 min^(-1)`.


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