Common Fuels
| Fuel | Density k g / m 3 kg/m^{3} kg/m3 | Specific Energy M J / k g MJ/kg MJ/kg |
|---|---|---|
| Gasoline | 716 | -47.3 |
| Kerosene | 830 | -46.2 |
| Diesel Fuel | 830 | -44.8 |
| Ethanol | 784 | -29.7 |
What is the energy density of a fuel?
Energy density is generally expressed in two ways, although the first is more common: Volumetric energy density – how much energy a system contains in comparison to its volume; typically expressed in watt-hours per liter (Wh/L) or Megajoules per liter (MJ/L).
Fuel energy density.
| Fuel | Energy density |
|---|---|
| Natural gas | 55 MJ/kg |
What is energy density and how is it calculated?
Energy Density is defined as the total amount of energy in a system per unit volume. For example, the number of calories per gram of food. Foodstuffs that has low energy density provide less energy per gram of food which means that you can eat more of them since there are fewer calories.
What is the most energy dense fuel?
hydrogen
The highest energy density fuel is hydrogen, which is also the simplest chemical component in existence. Gasoline, which is derived from refining crude oil, contains much more energy than coal (twice the lower grade bituminous) or wood (three times).
What is energy formula?
The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. = mgh. Unit. The SI unit of energy is Joules (J).
How do you calculate fuel density in chemistry?
To find density, we have to solve the equation for volume, or V. V = nRT / P. To incorporate mass, we can use the number of moles, or n. The number of moles equals the mass of the gas divided by the molecular mass.
How do you find the energy content in kJ G?
Multiply the grams by the Energy per gram to obtain the Energy. Note: The Energy per gram is the conversion factor. It should be multiplied in such a way that the energy is on top and the grams are on bottom because you want your final answer to be energy in Cal or kcal or kJ.
What is the energy density of diesel?
45.5 megajoules per kilogram
Diesel has an energy density of 45.5 megajoules per kilogram (MJ/kg), slightly lower than gasoline, which has an energy density of 45.8 MJ/kg.
How do you find the density?
The Density Calculator uses the formula p=m/V, or density (p) is equal to mass (m) divided by volume (V). The calculator can use any two of the values to calculate the third. Density is defined as mass per unit volume.
How do you calculate energy released in kJ mol?
Calculating energy changes
- = 100 × 4.2 × 20 = 8,400 J.
- It is also useful to remember that 1 kilojoule, 1 kJ, equals 1,000 J.
- Moles of propane burned = 0.5 ÷ 44 = 0.01136.
- So, the molar enthalpy change, ∆H = 8.4 ÷ 0.01136 = 739 kJ/mol.
Which fuel releases the most energy per gram of fuel?
Methane releases the most amount of energy per gram of fuel.
What is the density of gasoline?
| Fuel | Density@15°C – ρ – | |
|---|---|---|
| (kg/m3) | (lb/ft3) | |
| Gas oil | 825-900 | 51-56 |
| Gasoline | 715-780 | 45-49 |
| Fuel Oil No.13) | 750-850 | 47-53 |
Why is energy density important in fuels?
Energy stored in a given volume of fuel – higher volume-energy density means less space is require to store the fuel in the vehicle, which can result in less space needed for a fuel storage facility on the vehicle.
How do you find the energy of a photon?
Photons velocity equals the speed of light. Photons are massless, but they have energy E = hf = hc/λ. Here h = 6.626*10–34 Js is called Planck’s constant. The photon energy is inversely proportional to the wavelength of the electromagnetic wave.
What is the density of petrol in g cm3?
Petrol weighs 0.7489 gram per cubic centimeter or 748.9 kilogram per cubic meter, i.e. density of petrol is equal to 748.9 kg/m³.
What is the density of oil in g cm3?
0.9
Density of common fluids
| Fluid | Density (g/cm3) at 20C and 1 atm unless noted |
|---|---|
| olive oil | 0.9 |
| castor oil | 0.969 |
| sea water | 1.03 |
| milk | 1.028-1.035 |
What is the density of gasoline in g mL?
0.68 g/mL
The density of water is 1.00 g/mL and that of gasoline is appoximately 0.68 g/mL.
What is the energy content in Cal g for lipids?
9 kcal/g
Energy conversion factors
The average values of energy are expressed as the number of calories per 1 gram of the macronutrient. The Atwater general factor system includes energy values of 4 kcal per gram (kcal/g) (17 kJ/g) for protein, 4 kcal/g for carbohydrates and 9 kcal/g (37 kJ/g) for fat.
What is the energy content per 100 g of protein?
The relative energy content of carbohydrates, proteins and fats are as follows: Carbohydrates – 1,760 kJ per 100 grams. Proteins – 1,720 kJ per 100 grams. Fats – 4,000 kJ per 100 grams.
How do you find the energy density of a food example?
To find a food’s energy density, divide the number of calories in a serving by the number of grams in that serving. Energy density ranges in the very low category are from 0.5 to 1 calorie/gram. As you move to the high end, it’s from 4 to 9 calories per gram.
Is diesel more energy dense than gasoline?
The calorific value of diesel fuel is roughly 45.5 MJ/kg (megajoules per kilogram), slightly lower than petrol which is 45.8 MJ/kg. However, diesel fuel is denser than petrol and contains about 15% more energy by volume (roughly 36.9 MJ/litre compared to 33.7 MJ/litre).
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