ch4 reacts with cl2 to produce ccl4 and hcl at 25 degrees celsius. the heat of the reaction change of h = -152.9 kj per mole of ch4 reacted. calculate change of hf of ch4. (CCl4 change of Hf = 141.5 kJ/mol)(HCl change of Hf = -92.31 kJ/mol)