I don't think this compound actually exists.
Realgar is As4S4.
Ca(OH)2
The subscript refers to the amount of atoms of that element in the formula e.g. H2O means two atoms of hydrogen and one atom of oxygen in one molecule of water. Hope this helps.
Chemical formula is representative for the chemical compositon of a compound. Chemical equation is representative (describe) for a chemical reaction.
The difference between a chemical property and a chemical change is that the change is how the property of the chemical changes when it undergoes a chemical reaction.
Realgar is As4S4.
Formula: C6H12O6
H2O, water, melts at 00C .H4O does not exist.
The formua of beryllium hydroxide is Be(OH)2.
Symbol: Cs
Formula: C6H12O6