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+//Chapter-3,Example 14,Page 61
+clc;
+close;
+
+//Reaction.....Li(7) + H(1) ---> He(4) +He(4)
+
+m_r= 8.02636     // total mass of reactants in  a.m.u.
+
+m_p= 8.00774     // total mass of product in a.m.u.
+
+m= m_r -m_p    // increase in mass
+
+Q_value= m*931   // in electron volt   since 1 a.m.u. =931 MeV
+
+//since mass is decreased after reaction
+// Q value is positive
+
+printf('the Q value for the reaction is %.2f MeV',Q_value)
+