Chemistry » Physical and Chemical Change » Law Of Constant Composition

Volume Relationships in Gases

Volume Relationships in Gases

In a chemical reaction between gases, the relative volumes of the gases in the reaction are present in a ratio of small whole numbers if all the gases are at the same temperature and pressure. This relationship is also known as Gay-Lussac’s Law.

For example, in the reaction between hydrogen and oxygen to produce water, two volumes of \(\text{H}_{2}\) react with 1 volume of \(\text{O}_{2}\) to produce 2 volumes of \(\text{H}_{2}\text{O}\).

\[2\text{H}_{2}\text{(g)} + \text{O}_{2}\text{(g)} \rightarrow 2\text{H}_{2}\text{O (l)}\]

In the reaction to produce ammonia, one volume of nitrogen gas reacts with three volumes of hydrogen gas to produce two volumes of ammonia gas.

\[\text{N}_{2}\text{(g)} + 3\text{H}_{2}\text{(g)} \rightarrow 2\text{NH}_{3}\text{(g)}\]

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