If the amount of adams if each type on the left and right sides of a reaction difference what must be done to balance it

Hey there,

Your answer would be

Coefficients are placed in front of the reactants and/or products

Hope this helps,

it's c. elements are placed in rows based on how may valencies electrons have.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)