The standard heat of reaction for the combustion of liquid n-nonane (csh20) to form co2 and liquid water at 25°c and 1 atm is ah -6124 kj mol (a) write the chemical equation. comment on the mass and energy balances in terms of stoichiometric quantities. [2 marks] (b) the standard heat of combustion of n-nonane vapour is ah = -6171 kj/mol. calculate the difference between this heat of combustion and the one given previously and explain the physical significance of the difference. [2 marks] (c) what can you conclude about the energy required to break the molecular bonds of the reactants in this chemical reaction and that released when the product bonds form? explain the heat effect of the reaction from a molecular point of view. [2 marks] estimate the required rate of heat input or output (state which) in kilowatts, if 25 mol. s1 of liquid nonane com pletely react, the reactants and products are all at 25°c and the reaction happens according to the stoichiometry. [4 marks] (d) calculate the adiabatic temperature of the reactor if 25 mol. s1 of liquid nonane react completely according to the stoichiometry. use the following specific heat capacities of the components: (e) n-nonane: 2.1 kj. kg1.k1; carbon dioxide: 0.846 kj. kg1.k1; water (gas): 2.01 kj. kg1.k-1 and heats of formation: n-nonane (liquid): -229.03 kj. mol1; carbon dioxide (gas): -393.5 kj. mol 1; water (gas): -241.83 kj. mol 1 [7 marks] the value of ah given in part (b) applies to n-nonane vapour at 25°c and 1 atm, and yet the normal boiling point of n-nonane is 150.6°c. can n-nonane exist as a vapour at 25°c and a total pressure of 1 atm? explain your answer. [2 marks] (f) state briefly what the energy balance across a reactor tells the chemical engineer. (g)