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AB 品質守恆 1*2A+1*2B=2C A2B2=2C 2(AB)=2C C=AB 其實還可以用單質替代法 A2+B2=2C 如H2+Cl2=2HCl A2 H2 B2 Cl2 只要是單質,計量數一樣代替後得到也是可以的
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