Question #49034

1 Answer
Stefan V.
Mar 12, 2016

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.

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