Halogenoalkanes have been widely used as aerosol propellants, refrigerants and solvents for many years. fluoroethane, ch3ch2f, has been used as refrigerant. it may be made by reacting ethane with hydrogen fluoride. use relevant bond energies from the data booklet, and the equation below to calculate a value for the bond energy of the c-f bond. ch2=ch2(g) + hf(g) → ch3ch2f(g) ah®= -73 kj mol.