রসায়ন প্রশ্ন

CH3Cl(I)+Cl2(g)→CH2Cl2+HCl(g), this reaction occurs with endothermic bond dissociation and exothermic bond formation . Here bond energy of C-H ,C-Cl,Cl-Cl and H-Cl are 430,328,243 and 433 kj/mol. What will be the value ∆H of above the reaction?