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+// Ex9_1 Page:172 (2014)
+clc;clear;
+d = 3.8626;    // The average spacing between adjacent rotational lines of CO molecule, per cm
+B = d/2*100;    // Rotational constant, per m
+h = 6.626e-034;    // Planck's constant, Js
+c = 3e+08;    // Speed of light in vacuum, m/s
+I = h/(8*%pi^2*B*c);    // Moment of inertia of the CO molecule, kg/Sq.m
+N_A = 6.022e+023;    // Avogadro's number, atoms/mol
+M_C = 0.012;    // Isotopic masses of C-12 atom, kg/mol
+M_O = 0.016;    // Isotopic masses of Om-16 atom, kg/mol
+mu = M_C*M_O/((M_C + M_O)*N_A);    // Reduced mass of CO molecule, kg
+r = sqrt(I/mu);    // Bond length of CO, m
+printf("\nThe bond length of CO = %5.3e m", r);
+
+// Result
+// The bond length of CO = 1.128e-010 m