What is the number of atoms present in a 20.gram sample of lithium?

Name: What is the number of atoms present in a 20.gram sample of lithium?
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Quizplus · Accepted Answer

To find the number of atoms, first calculate the number of moles of lithium in 20 grams. The molar mass of lithium is approximately 6.94 g/mol. Thus, 20 g of lithium is about 2.88 moles. Using Avogadro's number (6.022 x 10^23 atoms/mol), the number of atoms is approximately 1.70 x 10^24.

What Is the Number of Atoms Present in a 20