How do I calculate moles

[From: ] [author: ] [Date: 12-04-30] [Hit: ]

I can't find out how to calculate how many moles are in an element/compound.
How many moles are in 40.0g of pb?

Divide by the atomic mass of Pb:

(40.0 g Pb) / (207.2100 g Pb/mol) = 0.193 mol Pb

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