试题与答案

某金属M的氢氧化物的结晶水合物M(OH)2·xH2O与Na2CO3的混合物共36

题型:计算题

题目:

某金属M的氢氧化物的结晶水合物M(OH)2·xH2O与Na2CO3的混合物共36.8g,加入足量的水后,生成白色沉淀(沉淀中不含结晶水),将沉淀过滤、洗涤、烘干,称得其质量为9.85g,将得到的沉淀高温灼烧后,质量变为7.65g,滤液与酸作用不产生气体,若用足量的铵盐与滤液共热,则产生4.48L气体(标准状况)。

(1)滤液中n(OH)=____________mol

(2)M的相对原子质量_____________________

(3)M的氢氧化物的结晶水合物的化学式为____________________

(4)将M的此氢氧化物与NH4Cl置右图所示装置(玻璃片中与烧杯底部之间有一薄层水)中混合反应后,用手拿起烧杯时,玻璃片将___________________,与该反应对应的能量变化关系图是_________

答案:

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参考答案:E

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