Silver atoms to Grams
The molar mass of silver is 107.9 g/mol. Therefore: n moles of silver atoms will have a mass of (n TIMES 107.9) g. The problem says: 6.89 g EQUALS (n TIMES 107.9) g; so we solve for n by dividing 6.89 by the molar mass (107.9). This (n) gives us the mole count.