Calculating the number of atoms in X Kilograms of iron

[Sun44]

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.

 

[Nytik]

Try using the Avogadro constant.

 

[Sun44]

Try using the Avogadro constant.

Whats that?

 

[QuarkCharmer]

https://www.youtube.com/watch?v=AsqEkF7hcII