Chem 101 Homework 9: Rate Laws Question 4

Question

Consider the radioisotope ²²⁶Ra (half life = 1.60 × 10³ years). What is the first order rate constant for ²²⁶Ra?

Answer= ______1/years

Answer 1

For a first order reaction, t_1/2 = ln2/k = 0.693/k

1.60x10³ yrs = 0.693/k

k= 4.3x10^-4 yrs^-1