The first order reaction is carried out starting with 10 mol L-1 of the reactant. It is 40 % complete in one hour. If the same reaction is carried out with an initial concentration of 5 mol L-1, the percentage of the reaction that is completed in one hour will be

Question

The first order reaction is carried out starting with 10 mol L-1 of the reactant. It is 40 % complete in one hour. If the same reaction is carried out with an initial concentration of 5 mol L-1, the percentage of the reaction that is completed in one hour will be (A) 40% (B) 80% (C) 20% (D) 60%

Tardigrade Admin · Accepted Answer

For a first order reaction, time taken for a definite fraction to complete is independent of initial concentration. In other words, in same time, same % age of reaction will be completed.

Q. The first order reaction is carried out starting with 10molL−1 of the reactant. It is 40% complete in one hour. If the same reaction is carried out with an initial concentration of 5molL−1, the percentage of the reaction that is completed in one hour will be

40%

80%

20%

60%

For a first order reaction, time taken for a definite fraction to complete is independent of initial concentration. In other words, in same time, same % age of reaction will be completed.

Q. The first order reaction is carried out starting with $10 m o l L^{- 1}$ of the reactant. It is $40%$ complete in one hour. If the same reaction is carried out with an initial concentration of $5 m o l L^{- 1}$ , the percentage of the reaction that is completed in one hour will be