pure hydrogen gas is burns gently, combining with the oxygen gas of the air to form water vapor
This is not a question.
The reaction between hydrogen gas and oxygen gas to form water vapor is a classic example of a combustion reaction. To understand why pure hydrogen gas burns gently when combined with oxygen gas, we need to understand some basic concepts.
Firstly, combustion requires a fuel source and an oxidizer. In this case, hydrogen acts as the fuel source and oxygen serves as the oxidizer.
When hydrogen gas (H2) combines with oxygen gas (O2), a chemical reaction occurs. The reaction can be represented by the equation:
2H2 + O2 → 2H2O
This equation indicates that, for every two molecules of hydrogen gas reacting with one molecule of oxygen gas, two molecules of water vapor are formed as the product.
The reason why pure hydrogen gas burns gently when combined with oxygen gas to form water vapor is due to the stoichiometry of the reaction. The stoichiometry refers to the molar ratio of reactants and products in a balanced chemical equation.
In this case, the stoichiometry of the balanced equation shows that the ratio of hydrogen gas to oxygen gas is 2:1. This means that for a complete reaction, you need two molecules of hydrogen gas for every one molecule of oxygen gas. If the ratio is not exactly 2:1, unreacted hydrogen or oxygen gas may remain after the reaction.
Furthermore, the reaction between hydrogen gas and oxygen gas is exothermic, meaning it releases energy in the form of heat and light. However, the reaction rate is relatively slow when hydrogen gas is burned in a controlled environment with a sufficient supply of oxygen, thus resulting in a gentle burn.
It's important to note that when dealing with hydrogen gas combustion, safety precautions are necessary, as hydrogen gas can be highly flammable and explosive.