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

Answer 1

Dimensional analysis:

18.54 g x 1 mol / 159.69 g = 0.1161 moles (4 sig. figs.)