Question 1 - Thermochemistry of the Metal/Teflon System ( 20 points): The mixtures of Magnesium/Teflon/Viton (MTV) are commonly used as pyrotechnic material (i.e. igniter in propulsion systems). Note that both Teflon and Viton (which serves as the binder) contain large concentrations of fluorine by mass which acts as the oxidizing agent in this particular class of pyrogens. For simplicity, we will restrict the calculations to the binary system of Metal/Teflon and to a particular grade of Teflon, polytetrafluoroethylene (PTFE), which is a straight chain polymer with a repeat unit of [C2F4]n (See the following figure for the structure of this long chain molecule). Molecular structure of PTFE a) Calculate the molar standard heat of formation for PTFE (per repeat unit [C2F4] ) using the bond additivity method. Assume that the heat of sublimation for PTFE at 298K is 100cal/g. b) Write out the stoichiometric reaction and estimate the heat of reaction per unit propellant mass for the systems Mg/PTFE and Al/PTFE. The standard molar heats of formation for the MgF2 and AlF3 molecules are 268.7 and 361.0kcal/mole, respectively. (Hint: Carbon only appears as graphite in the products) c) Which propellant has the higher reaction energy? Why? Explain based on your understanding of the atomic structure