Answer:
b) carboxylic acid ..........
Answer: The concentration of
will be
after 416 seconds have passed.
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 = 


The concentration of
will be
after 416 seconds have passed.
This looks correct to me! <3 have a good day