Consider the following representation of a reaction mechanism.
step 1: unimolecular (fast)
step 2: bimolecular (slow)
step 3: unimolecular (fast)
which conclusion about the rate law for the reaction above is reasonable?
a. it is first order overall because step 1 is unimolecular.
b. it is first order overall because both steps 1 and 3 are unimolecular.
c. it is second order overall because step 2 is bimolecular.

The correct answer is: D. It is second order overall because step 2 is bimolecular.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.