Mass, Avogadros Number, and the Atomic Nucleus

Molar Mass, Avogadro s Number and the Atomic Nucleus 

Formulating models A nuclear model of mass can provide a simple picture of the connections between the mole, molar mass, and the number of representative particles in a mole. 

The diagram shows models of the nuclei of hydrogen-1 and helium-4. The hydrogen-1 nucleus contains one proton with a mass of 1.007 amu. The mass of the proton in grams has been found experimentally to be 1.672 x 10 g. Helium-4 contains two protons and two neutrons and has a mass of approximately 4 amu. 

What is the mass in grams of one helium atom (The mass of a neutron is approximately the same as the mass of a proton.) 

Carbon-12 contains six protons and six neutrons. Draw a model of the nucleus of 

---