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Finding the average mass of molecules

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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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 ...

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This solution provides calculations and explanations for finding the average mass of molecules.

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