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Bell Ringer • Convert 6.3 grams of Ag to moles. Ag atomic mass is 107.8682 • Convert 7 moles of Kr to grams. Kr atomic mass is 83.798 • How many cm are in one meter? • How many km are in 1200 meters? • Draw what Niels Bohr purposed the atom to look like and what was this model called? Converting with Avogadro's Number Mr. Schlamb Review • Avogadro’s number: 6022*10^23 • This is the number of atoms in one mole of substance Conversions • We can do conversions with Avogadro’s number. • We can use Avogadro’s number of atoms of an element from moles • We can also use it to find the amount of element in moles from atoms See the book • Open the book to page 86 and 87 • In the first problem we are finding the amount in moles of Ag from the number of atoms. • Lets work this together on the board Next problem • In the next problem we are finding the mass in grams of Cu from the amount of atoms of Cu • Lets work this one together on the board as well Questions