1 (a) List the five main combustion products (each at least 1 vol%) expected from the combustion of octane with =1.2, oxidant of air, and a flame temperature of 2000 K. For each molecule state its origin or origins.

(b) Discuss the differences between a pure premixed flame and a pure diffusion flame. Consider flame characteristics, examples, burner design, and emissions.

(c) The composition of a wood sample on a dry ash-free basis is: 54% C, 40% O and 6% H by mass. The sample has 40% water content and 2% ash content, by mass.

(i) Calculate the sample stoichiometric air-fuel ratio by mass.

(ii) Calculate the CO2 emissions by mass, from the stoichiometric combustion of 1 kg of the sample.

Reference data: Relative atomic mass: H: 1, C: 12, N: 14, O: 16 Composition of air: 21% O2, 79% N2 (vol%)