Why is enthelpy of combustion 0Kjmol-1 for oxygen

• Daniel2244
In summary, the enthalpy of combustion for oxygen is defined as 0Kj/mol due to its highly reactive nature and participation in combustion reactions. This value remains constant regardless of conditions or environment. Compared to other elements, oxygen has a relatively low enthalpy of combustion due to its stability and strong bonds. The enthalpy of combustion for oxygen is significant in everyday life as it drives many combustion reactions and is essential in biological processes. It cannot be changed, but the enthalpy of combustion for other substances can be influenced by various factors.
Daniel2244

Homework Statement

Why is enthalpy of combustion 0KJmol-1 for oxygen?
I need to know this for my exam coming up soon.

Homework Equations

The enthalpy change when 1 mole of a substance is burnt in excess oxygen under standard states under standard conditions.

The Attempt at a Solution

Oxygen requires 0 energy to form as it is a natural element.

By definition I would say. II doesn't burn, it stays unchanged.

Daniel2244
Borek said:
By definition I would say. II doesn't burn, it stays unchanged.
That makes sense. Thanks for the help.

1. What is enthalpy of combustion?

The enthalpy of combustion is the amount of heat released when a substance undergoes complete combustion in the presence of oxygen. It is a measure of the energy stored in chemical bonds within the substance.

2. Why is the enthalpy of combustion for oxygen 0Kjmol-1?

Oxygen is a highly stable molecule and does not undergo combustion itself. Therefore, when it is used as a reference point for measuring enthalpy of combustion, it is assigned a value of 0Kjmol-1.

3. How is the enthalpy of combustion calculated?

The enthalpy of combustion is calculated by measuring the change in temperature of a system during combustion and using the formula Q = mcΔT, where Q is the heat released, m is the mass of the substance, and ΔT is the change in temperature.

4. What factors can affect the enthalpy of combustion?

The enthalpy of combustion can be affected by the type of substance being combusted, the amount of oxygen present, and the temperature and pressure of the system. It can also be affected by any impurities in the substance being combusted.

5. Why is the enthalpy of combustion important?

The enthalpy of combustion is important in understanding the energy content of different substances and their potential as fuels. It is also used in various industrial processes, such as power generation and chemical production, to determine the efficiency of combustion reactions.

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