Consider the reaction 2xy2+z2⇌2xy2z which has a rate law of rate= k[xy2][z2] select a possible mechanism for the reaction.

Answer is:
Step 1: XY₂+ Z₂ → XY₂Z + Z (slow).
Step 2: XY₂+ Z → XY₂Z (fast).
Overall reaction: step 1 + step 2:
XY₂+ Z₂ + XY₂+ Z ⇌ XY₂Z + Z + XY₂Z.
2XY₂+Z₂ ⇌ 2XY₂Z.
The sum of the two elementary steps is equivalent to the stoichiometric equation. Rate of chemical reaction depends on slow step (step 1).

Your answer is a just took the test

Answer : option a) 84explanation :

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.