An unbalanced chemical equation:a. does not obey Conservation of Mass law b. does obey Conservation of Mass law c. has equal numbers of atoms of each element in both reactants and productsd. none of the above

a. Does not obey Conservation of Mass law

Explanation:

An example of an unbalanced chemical equation is:

As you can see, there are two Na atoms on the right side of the equation, while only one on the left side, causing the masses on both sides of the equation to not be equal. In other words, not fulfilling the Conservation of Mass law.

Compare with the correctly balanced equation:

Now both sides of the equation possess the same number of atoms for each element.