Embed Size (px)
Citation preview
Oil Combustion and its contribution to CO2 emissionsChemistry in Context
Combustion ReactionCombustion reaction - is a sequence of exothermic reactions in which a substance reacts with oxygen, usually with the rapid release of heat to produce a flame
The products include one or more oxides
Organic compounds usually burn in oxygen to yield carbon dioxide
2C4H10(g) + 13O2(g) 8CO2(g) + 10H2O
Carbon Emissions
How much CO2 does one gallon of gasoline produce?
Carbon EmissionsAn 87-octane gasoline, is 87% (by volume) iso-octane (2,2,4-Trimethylpentane) and 13% n-heptane
C7H16
C8H18
Emission Calculations
1 US Gallon3.785 L
1 US GallonX = 3.785 L of gasoline
3.785 L of gasoline0.87 Iso-octane
1 L gasolineX = 3.29 L
Iso-octane
3.785 L of gasoline0.13 n-heptane
1 L gasolineX = 0.49 L
n-heptane
Carbon Emissions3.29 L of iso-octane
688 g
1 LX = 2,260 g iso-octane
0.49 L n-heptane684 g
1 LX = 335 g n-heptane
Hydrocarbon Density Molarity
C8H18 0.688 g/ml 114.22 g/mol
C7H16 0.684 g/ml 100.21 g/mol
CO2 1.98 g/L 44.01 g/mol
Carbon Emissions
Hydrocarbon Density Molarity
C8H18 0.688 g/ml 114.22 g/mol
C7H16 0.684 g/ml 100.21 g/mol
CO2 1.98 g/L 44.01 g/mol
2,260 g iso-octane1 mole
114.22 gX = 19.78 moles
iso-octane
335 g n-heptane1 mole
100.21 gX = 3.34 moles
n-heptane
Carbon Emissionsiso-octane combustion reaction:
C8H18 + 12.5O2(g) 8CO2(g) + 9H2O(g)
19.78 moles iso-octane = 158.24 moles CO2
C7H16 + 11O2(g) 7CO2(g) + 8H2O(g)
= 23.38 moles CO23.34 moles n-heptane
181.62 moles CO2
158.24 moles CO223.38 moles CO2+
Carbon Emissions
Hydrocarbon Density Molarity
C8H18 0.688 g/ml 114.22 g/mol
C7H16 0.684 g/ml 100.21 g/mol
CO2 1.98 g/L 44.01 g/mol
181.62 moles CO244.01 g
1 moleX = 7,993 g CO2
0.002204 lbs
1 g=7,993 g CO2
17.61 lbs CO2 Per gallon of gasoline
Carbon Emissions
2,595 g of Gasoline 0.002204 lbs
1 g= 5.7 lbs/gallon
Mass of Gasoline:
Mass of Carbon dioxide: 17.61 lbs CO2/gallon
“IF SOMEONE SAYS: “THAT’S IMPOSSIBLE” YOU SHOULD UNDERSTAND IT AS: “ACCORDING TO MY LIMITED EXPERIENCE
AND NARROW UNDERSTANDING OF REALITY, THAT’S VERY UNLIKELY"
