how many grams are in 1.8 x 10^23 atoms of silver

number of moles of silver = number of atoms / Avogadro number 

                                       = 1.8x10^23 atom/ 6.022x10^23 per moles

                                       =0.2989 moles 

mass in grams of silver    = number of moles * molar mass of substance 

                                       = 0.2989 moles * 107.87 gram /moles 

                                       = 32.34 grams 

Answer = 32.34 grams 

how many grams are in 1.8 x 10^23 atoms of silver