Answer to Question #168313 in General Chemistry for arianne

Question

write the formula for molybdenum(III) bromate trihydrate

Answer 1

Q168313

Write the formula for molybdenum(III) bromate trihydrate.

Solution:

The chemical symbol of molybdenum is Mo.

The roman number III inside the bracket tells us about the oxidation number of molybdenum.

roman number III corresponds to +3 oxidation state of Mo.

So this means our cation is Mo⁺³.

BrO₃^- is the bromate ion.

You will have to memorize the list of polyatomic ions with the charge on it.

The charge on Mo⁺³. is +3 and the charge on BrO₃^- is -1

for balancing the +3 charge of one Mo⁺³ we will require 3 anions of BrO₃ -.

Hence we have Mo(BrO₃)₃.

Next in molybdenum(III) bromate trihydrate, the trihydrate corresponds to the hydration number of the compound. Tri means there are 3 water molecules.

hence the molecular formula of the compound will be

Mo(BrO₃)₃. 3 H₂O.

please also refer to the image for a proper explanation.

Thank you. :)