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+//Chapter 2: Spectroscopy and Photochemistry
+//Problem: 7
+clc;
+
+//Declaration of Constants
+pi = 3.141                  // pi
+c = 3 * 10 ** 10            // speed of light, cm /s
+h = 6.626 * 10 ** -34       // Plank's constant, J.sec
+Na = 6.022 * 10 ** 23       // Mole constant, /mol
+
+//Declaration of Variables
+d = 20.7                    // Interspacing, /cm
+m1 = 1                      // Mass of H, g / mol
+m2 = 35.5                   // Masso f Cl, g / mol
+
+// Solution
+B = 0.1035 * 10 ** 2        // /m
+I = h / (8 * pi ** 2 * B * c)
+mu = m1 * m2 / ((m1 + m2) * Na)
+mu = mu * 10 ** -3
+r = sqrt(I / mu)
+
+mprintf("The intermolecular distance of HCl is %.3e m",r)
+// The answer provided in the textbook is wrong