# CO2 emissions per liter of fuel: petrol, diesel or LPG

What are the emissions CO2 following the fuel you use gasoline, diesel or LPG?

Recall the method

We start from the combustion equation to arrive at the finding that the mass of the releases in CO2 is: 44n.

N index of the hydrocarbon (family alkanesSee their classification) Whose general formula is C n H (+ 2n 2).

We studied the case of 3 most common fuels:
a) Essence
b) Diesel
c) LPG or LPG

Species: 2,3 kg per liter

Chemically, gasoline can be equated with pure octane or n = 8. In reality, there is more than 100 different molecules in gasoline, including additives.

Mass CO2 rejected by mole octane consumed is: * 44 8 352 = g.
The fuel consumption report on releases of CO2 is 352 / 114 3,09 =

Knowing that the density of gasoline is 0.74 kg / l and 1 gram of gasoline burned rejected 3.09 grams CO2, we get: * 0.74 3.09 2.28 = CO2 kg per liter of gasoline burned.

Or 2,3 kg CO2 per liter of petrol.

Diesel or heating oil: 2,6 kg per liter

Chemically, Diesl or heating oil can be equated with pure hexadecane or n = 16.

Mass CO2 rejected by mole octane consumed is: * 44 16 704 = g.
The diesel consumption report on releases of CO2 is 704 / 226 3,16 =

Knowing that the density of gasoline is 0.85 kg / l and 1 gram of diesel burned rejected 3.16 grams CO2, we get: * 0.85 3,16 2.67 = kg per liter CO2 disalt burned.

Given that diesel as fuel, a mixture of more or less heavy molecule, generally retain the value of 2,6.

Or 2,6 kg CO2 per liter of diesel.

LPG or LPG: 1,7 kg CO2 per liter (CAUTION See note below)

LPG is a mixture of butane and propane and is C4H10 C3H8. Next the oil varies the proportion of 40 60 to one or the other component.

We will retain an average value of 50 / 50 or 3,5 n = medium.

Mass CO2 rejected by mole octane consumed is: * 44 3,5 154 = g.
The diesel consumption report on releases of CO2 is 154 / 51 3,02 =

Knowing that the density of LPG 50 / 50 0.55 is about kg / l at ° C 15 and 1 gram LPG burned rejected 3,02 grams CO2, we get: * 0.55 3,02 1.66 = kg per liter CO2 disalt burned.

Or 1,7 kg CO2 per liter of LPG but

Important note: CAUTION this value is not comparable with that of petrol because the energy provided by a liter of LPG is much less than that of a gasoline or diesel fuel.

An LPG car so will consume at 25 30% of liters more compared to gasoline 100km which is perfectly logical since LPG weighs in 25 30% less than gasoline.

With gases, it is important to always think in weight and not by volume.

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## 1 comment on "Emissions of CO2 per liter of fuel: gasoline, diesel or LPG"

1. Martineaud said:

I am happy to read this page which highlights what has been for me for a long time.
But beyond that, we are not talking about the transformation of crude oil into gasoline, a more complex process than for diesel.
And if we want to tackle the diesel that pollutes then let's see the side of the ships ... when a real carbon tax on commercial transport that rebalance trade and revive local production. But that would not do the business of multinationals hence their lobbies and our pseudo ecologists who see no more than the tip of their nose ... or their corrupt portfolio.
And if we pass the vehicles electrically, how many EPR plants will it be necessary to power all these cars?
Moreover who manufactures batteries ... German and Chinese and in France ... Bolloré? QED. Not to mention recycling ... in progress?
In short, all this is only foutage mouth of our government who bail out the coffers of the state on our back ... as always since the dawn of time ... we cut heads at a time ...