Question #49034

1 Answer
Mar 12, 2016

Answer:

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.