If a sample of C-14 initially contains 1.5 mmol of C-14, how many millimoles will be left after 2255 years?

millimoles will be left after 2255 years.

Explanation:

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  

a)   of carbon = 5730 years

b) millimoles left after 2255 years

the answer is either b or c

i think it is true since you can test the answer and can use observations to complete it.