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2018年中考化学真题分类汇编1物质的构成和变化考点5物质的变化与性质4化学反应5化学方程式1配平（无答案）.doc

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1物质的构成和变化 考点 5 物质的变化与性质（18 桂林）16. 向原煤中加入适量生石灰制成“环保煤” ，可减少二氧化硫的排放，生石灰吸收二氧化硫的化学方程式为：2CaO + mSO2 + O2 = mCaSO4，则 m 的值是（ ）A.1 B.2 C.3 D.4

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