Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1.
(a) what is the half-life for this reaction?
(b) if you start with 0.052 m i2 at this temperature, how much will remain after 5.16 s assuming that the iodine atoms do not recombine to form i2?

a) Half life = 2.56 s

b) Remaining concentration after 5.16 s = 0.0128 M

Explanation:

Given,

Rate constant =

a)

Half life of a first order reaction is given by,

Half life =

             =

b)

Integrated rate law for first order reaction is:

Where,

A = Concetration after time 't'

A0 = Initial concentration = 0.052 M

k = rate constant = 0.271 s^-1

t = time = 5.16 s

i'm assuming that the correct answer is indeed the first one/ "a"..

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .