Abalanced chemical equation shows the proportions of reactants and products necessary for a. the reaction to occur. c. energy use to be minimized. b. mass to be conserved. d. electrolysis to occur.

Option (b) is the correct answer.

Explanation:

A balanced equation is defined as the equation where number of atoms of the reactant equal to the number of atoms of the product.

This also means that mass of the reactants is equal to the mass of products in a chemical equation.

For example,

Total mass of reactants =

                                      = 116 g/mol

Total mass of products = g/mol

                                      =  116 g/mol

Hence, mass if conserved in a chemical reaction.

thus, we can conclude that a balanced chemical equation shows the proportions of reactants and products necessary for mass to be conserved.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally