3. Calculate the thermal effect of the reaction CH4 Cl2=CH3Cl HCl if the thermal effects of the following reactions are known:
1. CH4 2O2=CO2 2H2O -892.0 kJ
2. CH3Cl 3/2O2=CO2 H2O HCl -687.0 kJ
3. H2 1/2O2=H2O -286.0 kJ
4. 1/2H2 1/2Cl=HCl -92.5 kJ
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