A chemical reaction `2A to 4B +C` in gas phase occurs in a closed vessel. The concentration of B is found to increase by `5 xx 10^(-3)` mol `L^(-1)` in 10 seconds. Calculate i) the rate of appearance of B ii) the rate of disappearance of A.

Answer

(i) `5xx10^(-4)" mol L"^(-1)s^(-1)` (ii) `2.5xx10^(-4)" mol L"^(-1)s^(-1)`

Explanation

Rate of appearance of `B=(Delta[B])/(Deltat)=(5xx10^(-3)" mol L"^(-1))/(10s)=5xx10^(-4)" mol L"^(-1)s^(-1)`
Rate `=-(1)/(2)(Delta[A])/(Deltat)=+(1)/(4)(Delta[B])/(Deltat)=+(Delta[C])/(Deltat)`
Rate of disappearance of `A=-(Delta[A])/(Deltat)=(2)/(4)(Delta[B])/(Deltat)=2.5xx10^(-4)" mol L"^(-1)s^(-1)`.