Afirst order reaction, a -> products, has a rate reaction of .00250 ms-1 when [a] = . 484 m. (a) what is the rate constant, k, for this reaction? (b) does t1/2 depend on the concentration

a)  The rate constant, k, for this reaction is

b) No does not depend on concentration.

Explanation:

Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.

Given: Order with respect to = 1

Thus rate law is:

a)

k= rate constant

The rate constant, k, for this reaction is

b) Expression for rate law for first order kinetics is given by:

where,

k = rate constant  

t = age of sample

a = let initial amount of the reactant  

a - x = amount left after decay process  

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

Thus does not depend on concentration.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge