Go to Main SiteMobile Site IndexMobile Site Index
 
How many atoms of lead are found in a 2 mg sample?

Reason it through carefully:

 

The atomic mass of lead is 210

therefore 210g lead contains NA atoms of lead

1 g lead contains NA/210 atoms

2 mg lead contains (NA/210) x 2 x 10-3 atoms

= 5.7 x 1018 atoms

Go to Main Site
Mobile Site Index