Question

Compare the mass of carbon dioxide produced per Joule of energy released from combustion of one gram of coal (anthracite), one gram of gasoline (assume 100% n-octane), and one gram of natural gas (assume 100% methane) respectively. Clearly show all balanced equations and all work. Use Wikipedia’s Heat of Combustion Table to access heat of combustion (MJ/kg) data. Divide each of your three ratios by the lowest ratio of the three to get relative rankings

Answer 1

Ranks for producing CO₂

1. combustion of coal anthracito) C(s) + 0₂ (9) - co₂ (9) 4lt=-432 kJ/mol From the above equation 44 g . q co₂ Produced from 432000 J energy amount of ca per 15 energy = 44 432 ovo = 1.0185x104 g = 10.185x105 g 2. combustion of octane (gasoline) kJ/mol cq H1 819) +250 (1) 8 Co₂ (9) + 9 H₂0 (1) oH=5450 - 8xuug of co, is produced from susoooo J energy 8 xuy e amount of co₂ Per I J energy = - susoooo = 6.4587x10 y 3. combustion methane (Natural gas) Cty (9) + 2 0219) Co₂ (9) + 2 H20 (1) AH = -890 kJ/mol 44 g. of cop is Produced from 890000 ] energy . a molut & co, Per IT energy = - = 4.943 X10 890000 . Natural gas Coal Compound gasoline amount of 102/10.185x105 6.45878105 4.943X105 Produced per 1J 6.4587x1054.943 Xlos Realive ratio 1u.qu3x105 4.943X105 ५.१५31 - 5 -5 110.185xios = 2 = 1.30 .06 ① Rank Rank Rank = = coal gasoline Mateord gas ② one

_Coal-1

_Gasoline-2

_{Natural gas-3}