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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7化学计算天平选择题（无答案）.doc

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1化学计算（2018绥化） 在已平衡的天平两边分别放一个等质量的烧杯，烧杯中装有等质量、等质量分数的足量稀盐酸，在左边烧杯中加入5.6g 金属铁，在右边烧杯中加入 5.5g 镁和铜的混合物，充分反应后天平仍然保持平衡，则右边烧杯中加入的混合物中镁和铜的质量比为（ ） A. 36：19 B. 12：43 C. 24：31 D. 13：42

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