Question

The balanced equation for the reaction of bromate ion with bromide in acidic solution is given by:

BrO₃- + 5Br- + 6H+ ---> 3Br₂ + 3H₂O
At a particular instant in time, the value of -Δ[Br-]/Δ t is 3.8 x 10⁻³ mol/L*s. What is the value of Δ [Br₂]/Δ t in the same units?
A) 6.3 x 10⁻³
B) 1.9 x 10⁻³
C) 3.2 x 10⁻³
D) 2.3 x 10⁻³
E) 3.8 x 10⁻³

Answer 1

The rate of appearance of Br₂(aq) can be calculated using the stoichiometric ratio and the rate of disappearance of Br-.

Step-by-step explanation:

The rate of appearance of Br₂(aq) in the reaction can be determined using the stoichiometric coefficients from the balanced equation. In the given equation, the coefficient of Br₂ is 3. Thus, for every 3 moles of Br₂ formed, 5 moles of Br- react. Therefore, the rate of appearance of Br₂ can be calculated by multiplying the rate of disappearance of Br- by the stoichiometric ratio:

Rate of appearance of Br₂ = Stoichiometric ratio * Rate of disappearance of Br-

Rate of appearance of Br₂ = 3/5 * 3.8 x 10⁻³ mol/L*s

Rate of appearance of Br₂ = 2.28 x 10⁻³ mol/L*s