How many moles of iron (iii) oxide is needed to produce 2 moles of oxegen

3 moles
Find the moles of 23.1 grams of iron (III) oxide using the molar mass of iron (III) oxide; Convert the moles of iron (III) oxide to moles of O2 using the balanced equation. We see that 3 moles of oxygen are need to produce 2 moles of iron (III) oxide.

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.