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海洋为人类提供了宝贵的自然资源． （1）食用海鱼摄取的主要营养素是 ． （2）下图为海水淡化装置，利用的能源是 ，获得的蒸馏水属于 （填字母序号）． A．单质      B．化合物      C．混合物 （3）从海水中提取食盐，采用的方法是 ． （4）用氯化钠和碳酸氢铵（NH 4 HCO 3 ）可制备碳酸氢钠和氯化铵（NH 4 Cl），该反应可表示为：NaCl+NH 4 HCO 3 ═NaHCO 3 +NH 4 Cl． 20℃时，按上述化学方程式中反应物的质量比，向100g水中加入11.7g NaCl和15.8g NH 4 HCO 3 ．理论上从溶液中析出晶体的质量为 g． 资料：20℃时四种物质的溶解度如下，假设它们同时溶解在水中各自的溶解度不变． 物质 NaCl NH 4 HCO 3 NH 4 Cl NaHCO 3 溶液度/g 36.0 21.6 37.2 9.6
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