Carbon tetrachloride can be formed by reacting chlorine with methane: C H subscript 4 space plus space 2 C l subscript 2 space rightwards arrow space C C l subscript 4 space plus space 2 H subscript 2 Given that the heat of formation of methane is –75 kJ/mol, the heat of formation of carbon tetrachloride is –135 kJ/mol, and the rest are zero, determine the heat of reaction, increment H space degree.