7717-65-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7717-65-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,1 and 7 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 7717-65:
(6*7)+(5*7)+(4*1)+(3*7)+(2*6)+(1*5)=119
119 % 10 = 9
So 7717-65-9 is a valid CAS Registry Number.