Question

For the reaction A+2B→C under a given set of conditions, the initial rate is 0.100 M/s.What is Δ[B]/Δt under the same conditions?

Answer 1

The rate of change of concentration of a reactant is equal to the initial rate multiplied by the stoichometric coefficient. Thus:
Δ[B]/Δt = 2 x 0.1
= -0.2 M/s (the negative sign is because B is a reactant.)

Answer 2

Answer: The rate of disappearance ( -Δ[B]/Δt) under the same conditions is 0.200 M/s.

Step-by-step explanation:

`A+2B\rightarrow C`

Initial Rate of the reaction = 0.100 M/s

Rate of disappearance of B:

`-(1)/(2)(\Delta [B])/(\Delta t)=0.100 M/s`

`-(\Delta [B])/(\Delta t)=2* 0.100 M/s=0.200 M/s`

The rate of disappearance ( -Δ[B]/Δt) under the same conditions is 0.200 M/s.