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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: meredypark3 on May 09, 2017, 04:44:42 PM

Title: Chemistry Conversion question
Post by: meredypark3 on May 09, 2017, 04:44:42 PM
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!
Title: Re: Chemistry Conversion question
Post by: Borek on May 09, 2017, 07:51:37 PM
Atoms of Fe or atoms in general?
Title: Re: Chemistry Conversion question
Post by: meredypark3 on May 09, 2017, 11:21:38 PM
Sorry for the typo, it's 1.25 × 1015 iron atoms
Title: Re: Chemistry Conversion question
Post by: Borek on May 10, 2017, 03:02:38 AM
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 (~).
Title: Re: Chemistry Conversion question
Post by: meredypark3 on May 11, 2017, 12:45:35 AM
Ahhh it was supposed to be 207.88g which would be the molar mass of Fe2S3