The decomposition reaction that takes place when electricity is passed through aluminum oxide is given by the balanced equation below. 2 Al2O3 - 4 Al + 3 O2
When 3.0 moles of Al2O3 decomposes in a reaction that goes to completion, how many moles of Al form?

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.