Determine the number of moles that are in 2500cg of iron(III) oxide

0.156 moles of Fe₂O₃

Explanation:

To determine the moles, we must divide mass (g) to the molar mass of the compound.

Fe₂O₃ → 159.7 g/mol (molar mass)

We need the mass of compound in g, so let's do the conversion:

2500 cg . 1g / 100cg = 25 g

Moles = mass / molar mass → 25 g / 159.7 g/mol = 0.156 moles of Fe₂O₃

the answer is symmetrical : )