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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