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Realgar is As4S4.
Ca(OH)2
I don't think this compound actually exists.
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.
The formua of beryllium hydroxide is Be(OH)2.
Symbol: Cs
Formula: C6H12O6
a+b=c
Formula: C6H12O6
Formula: Li2O
foemua of velocity is nEpAl
Realgar is As4S4.
Ca(OH)2
the symbol for calcium carbonate is Caco
Formula: (C2H5)2O
I don't think this compound actually exists.