[meredypark3]

Hello, I am unsure of the process to answer the following chemistry question:

If a sample of Fe₂S₃ contains 1.25×10¹⁵on atoms what is the mass in grams?

So far, I have got [tex] 1.25×10^{15} atoms × \frac {1 molecule} {2 atoms Fe}  ×  \frac  {1 mol} {6.02 × 10^{23}} × 201.88g [/tex]

However, I know that my values are incorrect as it does not match up with the answer I was given.

Thank you!

[Borek]

Atoms of Fe or atoms in general?

[meredypark3]

Sorry for the typo, it's 1.25 × 10¹⁵ iron atoms

[Borek]

OK, where did you got 201.88 from? Or is it a typo too?

What is the result you got, what is the answer you were given? In general logic behind your conversion factors is OK, even if you are a bit lousy about units and typos.

You can get [itex]spaces~in~\LaTeX[/itex] with a tylde (~).

[meredypark3]

Ahhh it was supposed to be 207.88g which would be the molar mass of Fe₂S₃