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倍比定律 - Wikipedia

倍比定律

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化學上,倍比定律(Law of multiple proportions)和定比定律同為化學計量學的基本定律。倍比定律由英國化學家约翰·道尔顿提出,故又名道爾頓定律

倍比定律內容:若兩元素可以生成兩種或兩種以上的化合物時,在這些化合物中,一元素的質量固定,則另一元素的質量成簡單整數比。

此定律說明了同一元素在不同的結合形式有兩種以上的化合量。舉例而言:一氧化碳(CO)和二氧化碳(CO2)同是氧化物。100克的碳和133克的反應以生成一氧化碳,和266克氧反應以生成二氧化碳。因此,可以和100克反應生成此二種碳氧化物的氧,其質量比是1:2(133:266),為簡單整數比。

道尔顿於1803年首次提出他觀察到的這個現象。在此之前幾年,法國化學家普勞斯特先提出了定比定律,指出元素由一定比例構成特定化合物。道尔顿以此為基礎提出倍比定律。這對於他之後提出的原子論有深遠的影響,並且奠定了後世使用化學式的基礎。

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