what is the mass ing of 6.52 x e18 atoms of gold?

Answer 1

(6.52*10^8 atoms gold) * (1 mol gold / 6.022*10^23 atoms) * (196.97 grams gold per mol gold) = ?

Answer 2

calculate the number of moles

1 mole = 6.0210^23 atoms so

6.5210^18 = 6.5210^18 /6.0210^23 =1.08310^-5 mole

the molecular weight of gold is 197

so the mass of gold is 197*1.08310^-5 =2.13 10^-3g =2.13mg

remark You must write in scientific notation else e can be understood as 2.718 basis of neperian logarithm!