Why is it necessary to find the percent yield of a reaction?
a) to determine the efficiency of the reaction
b) to determine the amount of reactants in the reaction
c) to determine the amount of products in the reaction
d) to determine the limiting reactant of the reaction

The percent yield of a reaction is calculated in this way:

Percent yield = [Actual yield / theoretical yield] * 100

To calculate theoretical yield you need to know the number of moles that may react and that calculation starts with the limiting reagent, which is the reagent that is completely consumed as per the stoichiometry of the reaction.

So, the answer is the option D) to determine the limiting reactant of the reaction.

What is the gold assay

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.