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[求助] 甲苯三段硝化计算三种酸的用量,请高手指教

现有102.4%的发烟硫酸、98.5%浓SA和97%的浓NA,需配制甲苯三段硝化混酸1254Kg,它的成份为SA78.4%、NA21.3%、H2O0.3%,求需三种原料酸各多少?
这道硝化方面的题怎么解呀??请高手指点一下呀??
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