（1）kal ：卡路里（简称，卡）； （2）kcal：千卡（大卡）； （3）j：焦耳（简称，焦）； （4）kj ：千焦。 单位换算 （1）1千卡 (kcal)=4.184千焦耳 (kj)； （2）1千焦耳 (kj)=0.239. 请写出明矾溶液和ba (oh)2溶液反应的方程式氢氧化钡与明矾的比例不同反映时生成的沉淀也不同小于等于1：2反应时只有baso4沉淀：kal (so4)2+2ba (oh)2=2baso4 (沉.
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