Chapter 1.2, Problem 13P

A mole is approximately the number of protons in a gram of protons. The mass of a neutron is about the same as the mass of a proton, while the mass of an electron is usually negligible in comparison, so if you know the total number of protons and neutrons in molecule (i.e., its “atomic mass”), you know the approximate mass (in germs) of a mole of these molecules.* Referring to the periodic table at the back of this book, find the mass of mole of each of the following: water, nitrogen $\left({\text{N}}_{\text{2}}\right)\text{,}$ lead, quartz $\left({\text{SiO}}_{\text{2}}\right)\text{.}$