Why is iron not extracted from its oxide using electrolysis?

This method of extraction works because carbon is more reactive than iron, so it can displace iron from iron compounds. Extracting a metal by heating with carbon is cheaper than using electrolysis. In the reaction of iron(III) oxide with carbon, state which substance is reduced and which substance is oxidised.

Explanation:

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

there are two significant figures.