Compare the mass of CO₂ produced per mass of fuel burned, i.e., the emission index of CO₂ (kg_CO2/kg_fuel), for the following fuels for operation at stoichiometric (Φ = 1.0) and lean (Φ = 0.7) conditions. Assume that all the fuel carbon appears in the products as CO₂. Treat the air as a simple mixture of N₂ (79%) and O₂ (21%).

i. Methane (CH₄)

ii. Propane (C₃H₈)

iii. Gasoline (C₈H₁₅-equivalent)

iv. Diesel fuel (C₁₅H₂₂-equivalent)