How many atoms are there in 41.7g of tin.(sn)? what is the mass of 2.37•10^22 atoms of xenon(xe) gas?

Explanation:

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In this case, to know the atoms contained into 41.7g of tin, one get the moles (using its atomic mass) into it and subsequently use the Avogadro's number as shown below:

On the other hand, we apply the conversely procedure but now using xenon's atomic mass as follows:

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