personunknown: The mass of a single rhodium atom is 1.71E-22 grams. How many rhodium atoms would there be in 238 milligrams of rhodium?
Hi unknown person!
The number of atoms is the total mass divided by the mass of 1 atom.
238 milligram / 1.71E-22 gram
0.238 gram / 1.71x10
-22 gram
(0.238 / 1.71) x 10
22 0.139 x 10
22 1.39 x 10
21
+135 
