Methyl bromide is a highly toxic gas used as a fumigant for soil. It can be produced by reacting methanol with hydrogen bromide in a substitution reaction as follows: CH3OH(l) + HBr(g) → CH3Br(g) + H2O(l) If the standard heat of formation of methyl bromide gas is −35.5 kJ/mol, what is the enthalpy of the above substitution reaction? Select one: a. −118.4 kJ b. −45.9 kJ c. −1.8 kJ d. −239.9 kJ