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The answer is b) Water.
a) and c) options are elements and d) option is a mixture.
Ions can be atomic or molecular. If an atom contains either positive or negative charge it said to be atomic cation or atomic anion.
When a molecule carry positive or negative charge it is called as polyatomic cation or polyatomic anion. Generally charged or ionized molecules are called as polyatomic ions.
In given question Fe(HCO₃)₃ ionizes as follow,
Fe(HCO₃)₃ → Fe³⁺ + 3 HCO₃⁻
The Ions produced are Fe³⁺ and HCO₃⁻. Fe³⁺ is said to be atomic (Ferric) ion and HCO₃⁻ (Bicarbonate) is polyatomic ion or molecular ion.
It should be
60.98 grams
^ this is rounded
A few examples of changes in chemical change are, a change in the color of the chemical, change in the energy or temperature, and lastly change of odor.
Hope I could help! :)