In the reaction \( \text{N}_2 + 3\text{H}_2 \rightarrow 2\text{NH}_3 \), ratio by volume of \( \text{N}_2, \text{H}_2 \) and \( \text{NH}_3 \) is \(1:3:2\). This illustrates law of:
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Gas reactions at same T and P follow simple volume ratios.