alleryFor the reaction 2HI(g) → H₂(g) + I₂(g), the rate of reaction is:
A+Δ[HI]/Δt
B2 × Δ[H₂]/Δt
C−Δ[HI]/Δt
D−½ × Δ[HI]/Δt = +Δ[H₂]/Δt = +Δ[I₂]/Δt
Answer & Solution
Correct answer: D. −½ × Δ[HI]/Δt = +Δ[H₂]/Δt = +Δ[I₂]/Δt
Rate must be defined the same way regardless of which species you track.
With a 2:1:1 stoichiometry, divide each ΔC/Δt by its stoichiometric coefficient: r = **−(1/2) Δ[HI]/Δt = +Δ[H₂]/Δt = +Δ[I₂]/Δt**.
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