Question Detail

CHM 101 CHM 101 Past Questions Objective Question

Question

For the hypothetical reaction A + 3B → 2C, the rate of appearance of C given by (Δ[C]/Δt) may also be expressed as
Options
A Δ[C]/Δt = -Δ[A]/Δt
B Δ[C]/Δt = -(3/2) Δ[B]/Δt
C Δ[C]/Δt = -(2/3) Δ[B]/Δt
Correct Answer
D Δ[C]/Δt = (1/2) Δ[A]/Δt
Correct Answer

Option C is the correct answer.

Detailed Explanation

From stoichiometry: (1/2)(Δ[C]/Δt) = -(1)(Δ[A]/Δt) = -(1/3)(Δ[B]/Δt). Thus Δ[C]/Δt = -(2/3)(Δ[B]/Δt).

Hint

Use the relationship: (1/coefficient of product) × (rate of appearance) = -(1/coefficient of reactant) × (rate of disappearance).

Question Info