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…showed last 75 words of 580 total…this using three oxides of nitrogen. The compound NO has equal amounts of nitrogen to oxygen, 1:1. The compound N2O has twice as much nitrogen by volume as oxygen, 2:1. And then lastly, N3O, nitrogen having three times as much volume as oxygen, 3:1. The second part of his law state that if gases combine to form gases, the volumes of the products are also in simple numerical ratios to the volume of the original gases.