Question

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 CO,(g) produced per megajoule of heat released from the combustion of each fuel under standard conditions (1 atm and 25 °C). coal, C(s, graphite) mol · MJ-1 natural gas, CH,() mol · MJ-' propane, C, H,(8) mol. MJ- octane, C,HAH; = -250.1 k) mol! mol · MJ-1

Answer 1

According to the condition given in question let us stoat from coal, c graphite. Cost O2(g) → (029) ottp =-343,51 kg/mol I mol releases 393.5 kJ 39 3,51 kJ xiMJ = 0.34 351 MJ 1000 Dog - DH Dup = Enthalphy of foomation Dit: Total enthalphy. ne molesi for coal : imore - 2.54 mol/mJ 0.3935img

for CHys CH4 + 20, 00, + 2H20 . E-890, 36 ky/mole. = -0.8903 MJ/mol. CHY - Imo / ans = 112 mol/MT | 6, 870 36 m) Poopane -_C3H8:- DHE = - 104.7 kJ/mol C+02 00 = -393.51 k mol - 3c +4Hty → CHP -104.7 kylmol P; + Joy ->Học : -38 5. SE3 Ino/ C3H8 +50₂ 300₂ + 4H₂O (C+02 —> com )3 = - 343.51x3 C3H8 - 3C +4H2 = 104.7 + H2O 4 = -985.8 x 4, (348 + 50, 300,+ 4H20. AH, :-2219.03 kJlmoi - 2.219.03 My Imole C3H8 - 3mol 2,91903 min 1.35 mol for Octane Cg H18 : 8c + 9H, CH18 OHp = -250.1Kg/mol Cg H18 - 800, +9H20 o: Ghig -> 80 + 9H2 = 950.1 (142 +402 —H20)4 = - 285.889 (c +02 02)8 = -393. 51 x8

Cg Hig + 12.802 - & co2 + 9H₂0 DH - 5470.28 kJ Imo I -5.47 mg/mol Cg Hig - 8 moi 5,47mJ = 1.46 mol/mJ .