The oval surrounding their name was meant to protect them from evil spirits in life and after death. The cartouche has become a symbol representing good luck and protection from evil. Egyptians believed that one who had their name recorded somewhere would not disappear after death. A cartouche attached to a coffin satisfied this requirement.
A single mole can construct 200 mounds over the course of a winter. (Drawing by Jenifer Rees.) Moles construct two kinds of tunnels: surface tunnels and deep tunnels, or runways. Surface tunnels are located 1 to 4 inches below the surface.
The idea here is that you need to use neon's molar mass, which tells you what the mass of one mole of the element is, to determine how many moles you have in that 5.9-g sample. Once you know how many moles you have, you can use Avogadro's number to find the number of atoms. So, neon has a molar mass of 20.18 g/mol, which means that every mole of neon has a mass of 20.18 g. Now, you know that one mole of any element contains exactly 6.022â1023 atoms of that element - this is Avogadro's number.