Many power plants produce energy by burning carbon‑based fuels, which also produces carbon dioxide. carbon dioxide is a greenhouse gas, so over‑production can have negative effects on the environment. use enthalpy of formation data to calculate the number of moles of co₂(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1 atm and 25 °c).a) coal c (s, graphite)b) natural gas, ch₄ (g)c) propane, c₃h₈ (g)d) octane, c₈h₁₈ (l) delta h f = -250 kj mol⁻¹