At a certain temperature the rate of this reaction is second order in nh4oh with a rate constant of 34.1 m^-1*s^-1:
nh4oh(aq) > nh3(aq) + h2o (aq)
suppose a vessel contains nh4oh at a concentration of 0.100m. calculate how long it takes for the concentration of nh4oh to decrease to 0.0240 m. you may assume no other reaction is important. round your answer to 2 significant digits.

It will take 0.93 seconds the concentration of to decrease to 0.0240 M.

Explanation:

Integrated rate law for second order kinetics is given by:

k = rate constant

= half life of reaction

= initial concentration

a= concentration left after time t

We have :

Initial concentration of ammonium hydroxide =

Final concentration of ammonium hydroxide after time t=

Rate constant of the reaction = k =

Solving for t:

t = 0.93 seconds

It will take 0.93 seconds the concentration of to decrease to 0.0240 M.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.