The CAS Registry Mumber 11073-68-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,1,0,7 and 3 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 11073-68: (7*1)+(6*1)+(5*0)+(4*7)+(3*3)+(2*6)+(1*8)=70 70 % 10 = 0 So 11073-68-0 is a valid CAS Registry Number.