# Finding the average mass of molecules

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What is the average mass in grams of the Cobalt (Co) atom? And how many grams of nitrogen dioxide contain the same number of molecules as 5.00 grams of water?

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#### Solution Preview

Question: What is the average mass in grams of the Cobalt (Co) atom?

Response: The mass of 1 mol of cobalt atoms is 58.9332 g. How do we know this? We know because the atomic mass is 58.9332 amu (atomic mass units). Just look it up on the Periodic Table.

Now, 1 mol of anything = 6.022x10^23 ...

#### Solution Summary

This solution provides calculations and explanations for finding the average mass of molecules. How many grams of nitrogen dioxide contains the same number of molecules of water is determined.

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