At 25°C 12 M H202 is decomposed after 30 minutes the concentration of the H2O2 is found to be 9.5 M what is the average reaction rate for this decomposition reaction.

The decomposition reaction of hydrogen peroxide:

2 H₂O₂ (aq) → 2 H₂O (l) + O₂ (g)

The order of reaction is : first order reaction.

[H₂O₂]₀ = 12 M at time = 0

[H₂O₂] = 9.5 M at time = 30 minutes

Average reaction rate = - (Δ[reactants] / Δt)

= - (final reactants conc. - initial reactants conc.) / Δt

= - (9.5 M - 12 M) / (30 min - 0 min)

= 0.083 mol / L. min