# Why is it important to know the energy content of fuels?

## Why is it important to know the energy content of fuels?

Energy content is an important property of fuels. This property helps scientists and engineers determine the usefulness of a fuel. Energy content is the amount of heat produced by the burning of 1 gram of a substance, and is measured in joules per gram (J/g).

How do you measure the energy in fuels?

Calculate the energy released per gram of fuel using the following equation.

1. Energy given out = mass of water × 4.2 × temperature change.
2. Energy measured in joules, J.
3. 4.2 is the specific heat capacity of water, J/g°C.
4. Temperature change = temperature of water after heating – temperature of water before heating.

### How do fuels release energy?

The stored energy in fuels can be released by combustion. Combustion is the burning of a substance. The release of energy from fuels is used to make other forms of energy. When gasoline burns in a car engine, some of the chemical energy in the gasoline is converted into heat.

Which fuel releases the most energy?

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).

#### How is the energy in the oil converted to useful heat energy?

The burning oil itself doesn’t leave the combustion chamber. Instead, the heat from the burning oil travels into a circulator or heat exchanger. There, the heat comes into contact with either air or water depending on the type of system. Systems that use air pull cold air from the house into the heat exchanger.

How does the presence of oxygen in the structure of a fuel affect its heat content?

Certain burners and oxy-fuel fired systems can achieve lower levels of nitrogen oxide, carbon monoxide, and hydrocarbons. Improve temperature stability and heat transfer. Increasing the oxygen content allows more stable combustion and higher combustion temperatures that can lead to better heat transfer.

## What energy is released when fuel is burned?

chemical energy
It is chemical energy . Hydrogen burns with oxygen to produce water vapor. Energy in the form of heat is released.

Why do some fuels release more energy?

The more hydrogen per carbon, the lower the oxidation state and the more energy that will be released during the oxidation reaction. Thus the greater the H/C ratio, the more energy release on combustion.

### What reaction releases energy from fuel?

Combustion reactions
Combustion reactions When these fuels burn, they release heat energy and light energy to the surroundings in exothermic reactions. Endothermic reactions take in heat energy. These reactions are known as combustion reactions and can be represented by different equations.

Why do some fuels release more energy than others?

The amount of energy released is dependent on the oxidation state of the carbons in the hydrocarbon which is related to the hydrogen/carbon ratio. The more hydrogen per carbon, the lower the oxidation state and the more energy that will be released during the oxidation reaction.

#### What happens when fuels are burned?

When fossil fuels are burned, they release carbon dioxide and other greenhouse gases, which in turn trap heat in our atmosphere, making them the primary contributors to global warming and climate change.

How do you calculate the energy released when a fuel burns?

When fuels burn they release heat energy and light energy to the surroundings in exothermic reactions known as combustion reactions. The energy released can be calculated using the equation Eh=cm∆T.

## What happens when a compound is used as a fuel?

Many different compounds can be used as fuels, most commonly alkanes and alcohols. When these fuels burn, they release heat energy and light energy to the surroundings in exothermic reactions. Endothermic reactions take in heat energy. These reactions are known as combustion reactions and can be represented by different equations.

How do you calculate the Order of energy given off from fuel?

Formula: E = m x c x ΔT E is the Energy Transferred – This is what we want to work out. ΔT is the temperature rise from the results table. Propanol: 25g x 4.2 x 43oC = 4515 ÷ 2.2g = 2052.3j/g Octanol: 25g x 4.2 x 46oC = 4830 ÷ 0.8g = 6037.5j/g Order of Energy given off from each fuel:

### How can the results of an experiment be made more precise?

This experiment could been more precise by using the same spirit burner, the same wick but different fuels. This could ensure more accurate results to be recorded. When speaking to the other group that did the same experiment, I found out that they had got the same pattern of results – Methanol, Ethanol, Octanol then Propanol.