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## Homework Statement

If you have 4.5 x 10

^{20}molecules of SnO

_{2}, how many moles of O do you have?

## The Attempt at a Solution

I'm really getting the hang of moles lately but what is bothering me in this question is 4.5 x 10

^{20}

**molecules**of SnO

_{2}.

If it was one molecule, you would have 2 moles of O yes?

Therefore in 4.5 x 10

^{20}molecules, you have 4.5 x 10

^{20}multiplied by 2? But that doesn't give me the correct answer.