How many moles of iron is equivalent to 4.05 x 1022 atoms of iron?

The problem described above is a simple conversion problem. To determine the number of moles of a substance given the number of particles of a substance, we use the Avogadro's number. It represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of ions, atoms or molecules into number of moles. We do as follows:

4.05 x 10^22 atoms of iron ( 1 mol iron / 6.022 x 10^23 atoms iron) = 0.0673 moles of iron

Therefore, 4.05 x 1022 atoms of iron is equal to 0.0673 moles of iron.

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.