31102-91-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 31102-91-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,1,0 and 2 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 31102-91:
(7*3)+(6*1)+(5*1)+(4*0)+(3*2)+(2*9)+(1*1)=57
57 % 10 = 7
So 31102-91-7 is a valid CAS Registry Number.