Consider a certain reaction `A rarr` Products with `k=2.0xx10^(-2)s^(-1)`. Calculate the concentration of `A` remaining after `100s` if the initial co

Question

Consider a certain reaction A→ Products with k=2.0×10-2s-1. Calculate the concentration of A remaining after 100s if the initial concentration of A is 1.0molL-1. Select the correct answer from above options

Answer 1

Correct Answer - 0.135moleL-1 The unit of k(i.e.,s-1) shows that the reaction is of first order. Hence, k= 2.303 t log [A]initial [A]left =∴2.0×10-2s-1= 2.303 100s log 1.0molL-1 [A]left orlog[A]remainingorleft=-0.8684 ∴[A]=Antilog(-0.8684) =Antilog(--0.8684+1-1) =Antilogbar(1).1316=0.1354mol L^(-1)