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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?

 May 22, 2017
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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.

 May 22, 2017
edited by Guest  May 22, 2017

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