"verify that the number of atoms..." Avagadro's constant 1. The problem statement, all variables and given/known data One mole of a substance is defined as an amount, in grams, numerically equal to its molecular mass expressed in amu. (when we refer to a chemical element and not a compound, we use the atomic mass.) Verify that the number of molecules (or atoms) in one mole of any substance is the same, and is equal to 6.0225 x 10^23. This number, called Avogadro's constant, is a very important physical constant. **************** I've just started trying to learn physics, and this problem appeared in one of the questions that are at the end of each chapter. The book is "Alonso-Finn Fundamental University Physics. Book 1: Mechanics" The question is question number 2.8 I am taking a physics course next year and would like to learn as much as I can before I go into the class. 2. Relevant equations Avogadro's Constant: 6.0225x10^23 Not sure what else is needed. 3. The attempt at a solution I've attempted a couple times but, I am not sure how to set up an equation properly as to get a result. The problem states that it will work with any substance, although i've been told that it only works for carbon-12? [6.0225x10^23 = 1 gram so 1 gram X 12amu = 12grams] Any and all help to point me in the right direction is appreciated! Thanks, John.