Give the coordination numbers and write the formulas for each of the following, including all isomers where appropriate:
(a) tetrahydroxozincate(ii) ion (tetrahedral)
(b) hexacyanopalladate(iv) ion
(c) dichloroaurate(i) ion (note that aurum is latin for "gold")
(d) diamminedichloroplatinum(ii)(e) potassium (iii)(f) hexaamminecobalt(iii) hexacyanochromate(iii)(g) dibromobis(ethylenediamine) cobalt(iii) nitrate

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

it is b that is the answer.