Help with periodic Table question, express the area in square meters

[ilovewatermelon]

View attachment 8371View attachment 8370

 

[tkhunny]

HInt: The long way from miles to kilometers...

$1\;mile\cdot\dfrac{5280\;ft}{1\;mile}\cdot\dfrac{12\;in}{1\;ft}\cdot\dfrac{2.54\;cm}{1\;in}\cdot\dfrac{1\;m}{100\;cm}\cdot\dfrac{1\;km}{1000\;m}$

Why is your problem any more difficult than this one?

Anyway, you seem to have forgotten that it was SQUARED and you didn't find the right factor.

$1\;\mu m = 10^{-6}\;m$

It's also possible the system is wondering where your units are hiding. $m^{2}$?

 

[ilovewatermelon]

I accidentally posted the wrong picture to go with it. Gonna post another picture

 

[I like Serena]

I accidentally posted the wrong picture to go with it. Gonna post another picture

We can find the periodic table for instance here: https://www.ptable.com
Which numbers are listed for $\ce{Cr}$?