The mass of a single strontium atom is 1.46×10-22 grams. How many strontium atoms would there be in 129 milligrams of strontium?
The mass of a single strontium atom is 1.46×10-22 grams. How many strontium atoms would there be in 129 milligrams of strontium?
Since the mass of a single strontium atom=1.46 x 10^-22 grams, therefore 1 gram of strontium =1/{1.46 x 10^-22} =6.85 x 10^21 atoms of strontium.
Since 1 gram =1,000 milligrams, therefore: {6.85 x 10^21} x {129/1,000} =8.8365 x 10^20 atoms of strontium in 129 milligrams.
