<u>Answer:</u> The rate constant for the reaction is
<u>Explanation:</u>
Rate law expression for first order kinetics is given by the equation:
where,
k = rate constant = ?
t = time taken for decay process = 2.00 min = 120 seconds (Conversion factor: 1 min = 60 seconds)
= initial amount of the sample = 100 grams
[A] = amount left after decay process = 20 grams
Putting values in above equation, we get:
Hence, the rate constant for the reaction is