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# Homework HELP!! watch

1. Hi, i need some help on some AS Chemistry questions

1) Iron atoms have a diameter of approximately 2.5 x 10^-10m
A pin head has a diameter of approximately 1mm (1x 10^-3m)
so the number of atoms across the diameter of the pen head would be ?

2) And the approximate number of atoms covering the surface of the pin head would be?
Hi, i need some help on some AS Chemistry questions

1) Iron atoms have a diameter of approximately 2.5 x 10^-10m
A pin head has a diameter of approximately 1mm (1x 10^-3m)
so the number of atoms across the diameter of the pen head would be ?

2) And the approximate number of atoms covering the surface of the pin head would be?
This is not chemistry it's basic maths.

1. If something measures x how many would fit into a distance y.

2. If something has an area of pi*d how many fit into another area of pi*D (although in truth this one should be a little more complex, but that's covered by the word "approximate" )

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Updated: September 13, 2015
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