What is the mass of 3.8⋅1024 atoms of argon?

1 Answer
anor277
Oct 17, 2016

3.8×1024 argon atoms have a mass of approx. 250⋅g.

Explanation:

6.022×1023 argon atoms have a mass of 39.95⋅g. How do I know this? Well, 6.022×1023 is Avogadro's number, and the Periodic Table lists the mass of Avogadro's number of each atom.

And thus we calculate the product:

3.8×1024 argon atoms6.022×1023 argon atoms mol−1×39.95⋅g⋅mol−1 = ??g

Argon is often used in the laboratory to provide a protective blanket of inert gas for reactions with air and water sensitive reagents. Why should argon be unreactive towards the reagents?

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