The given chemical formula represents a complex compound consisting of zirconium (Zr), phenylphosphonate (C6H5PO3), hydrogen phosphate (HPO4), and water (H2O). The formula can be broken down as follows: Zirconium (Zr) is in the +4 oxidation state, and it is coordinated with 0.5 phenylphosphonate (C6H5PO3)2- ligands, 1.5 hydrogen phosphate (HPO4)2- ligands, and 2 water (H2O) molecules. This complex compound can be represented as Zr(C6H5PO3)0.5(HPO4)1.5·2H2O, indicating that it is a coordination complex with zirconium at the center, surrounded by various ligands and water molecules.
The CAS Registry Mumber 76900-20-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,9,0 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 76900-20: (7*7)+(6*6)+(5*9)+(4*0)+(3*0)+(2*2)+(1*0)=134 134 % 10 = 4 So 76900-20-4 is a valid CAS Registry Number.