For a first order reaction at 27^ C , the ratio of time required for 75 % completion to 25 % completion of reaction is

Step-by-step solution

For a first order reaction, t= 2.303 ₁₀ a a-x Let initial amount of reactant is 100 . aligned t₁ t₂ = & 100 100-75 100 100-25 & = 100 25 100 75 aligned aligned & = 4 4 / 3 & = 4 4- 3 & = 2 0.3010 2 0.3010-0.4771 & = 0.6020 0.1249 & =4.81 aligned