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元素種類不變也算是品質守恆定律.
出去木炭粉中少量的氧化銅粉末-----------加稀硫酸,氧化銅與硫酸反應,木炭粉不反應 制取硫酸鐵: 氧化鐵和稀硫酸反應:Fe2O3 + 3H2SO4 === Fe2(SO4)3 + 3H2O
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