If you were to compare the mass of the products and reactants in a reaction, you would find that the mass of the products is always greater the mass of the reactants is always greater the mass of the products is equal to the mass of the reactants the mass of the products may be greater or less than the mass of the reactants

8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right

explanation:

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.