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## Homework Statement

I'm having trouble with this. I need to calculate the number of atoms in iron. How do I do this? For example if I had 1 KG of iron, how many atoms are in it?

## Homework Equations

I need to give an answer in scientific notation

A x 10^B

A being 1 significant figure, and B being whole number

## The Attempt at a Solution

No idea what to do.