The total number of atoms in 3Na2O?

One similarity and one difference between an element and a mixture of elements

Match each term to its description. match term definition excess reactant a) reactant that can produce a lesser amount of the product limiting reactant b) amount of product predicted to be produced by the given reactants theoretical yield c) reactant that can produce more of the product

Hydrogen has three isotopes 1h, 2h, and 3h. what is the difference between these three isotopes?