Question

The rate constant of the reaction

2H₂O₂ (aq) ¾® 2H₂O (l) + O₂ (g) is 3 × 10^–3 min^–1

At what concentration of H₂O₂ , the rate of the reaction will be 2 × 10^–4Ms^–1 ?

• A. 6.67 × 10^–3(M)
• B. 2 (M)
• C. 4 (M)
• D. 0.08 (M)

Answer 1

Answer: (C)

4 (M)

Answer 2

Sol. – $\frac{d\lbrack H_{2}O_{2}\rbrack}{dt}$ = k [H₂O₂]¹

\ 2 × 10^–4 = $\frac{3 \times 10^{- 3}}{60}$× [H₂O₂]

or [H₂O₂] = 4 (M)