Moles of Fe in 3.13×1022 atoms of Fe

0.05 moles

Explanation:

To convert from atoms to moles, you will need Avogadro's number.

Avogadro's number: 6.022×10²³atoms/moles

(3.13×10²²atoms)×(moles/6.022×10²³ atoms)=0.05 moles

The atoms would cancel out and we will be left with our moles.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.