A. Define conversion factor.

A conversion factor is an expression for the relationship between units that are used to change the units of a measured quantity without changing the value. A conversion ratio (or unit factor) always equals one, where the numerator and the denominator have the same value expressed in different units.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.