Hematite is the mineral form of iron(III) oxide. Calculate the number of iron ions in 20.0 kg of pure hematite.

Question

Quizplus · Accepted Answer

Hematite (Fe2O3) has a molar mass of 159.69 g/mol. 20.0 kg is 20,000 g, which is 125.3 moles of hematite. Each mole of hematite contains 2 moles of iron ions, so there are 250.6 moles of iron ions. Using Avogadro's number (6.022 × 10^23 ions/mol), the number of iron ions is approximately 1.51 × 10^26.

Hematite Is the Mineral Form of Iron(III) Oxide