A laboratory microbalance can measure a mass of one-tenth of a microgram, a very small speck of matter. How many atoms are there in such a speck of gold, which has 197 grams in one mole?

Question

wolfe8 · Answer

Welcome to OpenStudy. So you want 0.001 g of gold. You know 1 mole = 197 g. Find the number of moles, then multiply if with Avogadro's number,

anonymous · Answer

hey i got the answer 3.05x10^18. It's still giving me worng. please help

wolfe8 · Answer

197 g = 1 mole
0.001 g = 0.001/197 mole

(0.001/197)*6.022*10^23 

Try taking 3 decimal places.