7669-40-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7669-40-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,6 and 9 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 7669-40:
(6*7)+(5*6)+(4*6)+(3*9)+(2*4)+(1*0)=131
131 % 10 = 1
So 7669-40-1 is a valid CAS Registry Number.