Question

Question #49034

Answer 1

Actinium(III) oxide.

Explanation:

Actinium(III) hydroxide, `"Ac"("OH")_3`, will decompose upon heating to form water and actinium(III) oxide, `"Ac"_2"O"_3`.

Just like the hydroxide, the oxide contains actinium in its `+3` oxidation state.

The balanced chemical equation for this decomposition reaction looks like this

`2"Ac"("OH")_text(3(s]) stackrel(color(red)(Delta)color(white)(aa))(->) "Ac"_2"O"_text(3(s]) + 3"H"_2"O"_text((g])`

The symbol `color(red)(Delta)` is used to symbolize the fact that the reaction requires heat.