Chemistry
Reaction Rate
Calculate average reaction rate from concentration change.
Average Rate = -Δ[Reactant]/Δt = Δ[Product]/Δt
Formula Explanation
Reactant concentration decreases while product concentration increases. Stoichiometric coefficients must be considered for a normalized reaction rate.
Variables Explained
Δ[ ] = Change in concentration; Δt = Time interval.
Solved Example
A reactant concentration falls from 0.8 to 0.2 mol/L in 3 seconds.
Average disappearance rate = -(0.2 - 0.8)/3 = 0.2 mol/(L·s).