The reaction rate is the change in the concentration of either the reactant or product (X) per unit of time (1). Considering the definition, which mathematical formula can we use to express the reaction rate?
a) Rate = Δ[X] + Δt
b) Rate = Δ[X]/Δt
c) Rate = Δ[X]Δt
d) Rate = ΔXt/Δ[X]
