The molar mass of Fe2O3 is 159.69 g/mol. A student measured the mass of a piece of Fe2O3 and found it to be 18.54 grams. This is ___ moles of Fe2O3. Use 4 significant figures.

Answer 1

Hi Umer!

To solve this question, we use the fact that 1 mole of Fe₂O₃ is 159.69 grams. Using dimensional analysis we can divide the given sample mass of 18.54g by the molar mass of 159.69 g/mol as follows:

18.54 grams / 159.69 grams/mol = 0.1161 moles

I hope that helps!