16838-18-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 16838-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,8,3 and 8 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 16838-18:
(7*1)+(6*6)+(5*8)+(4*3)+(3*8)+(2*1)+(1*8)=129
129 % 10 = 9
So 16838-18-9 is a valid CAS Registry Number.