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16、把1.8克某二价金属的硫酸盐溶于水中,使其体积达25毫升。与溶解的硫酸盐反应需要20毫升0.75M氯化钡溶液。计算:(1)原硫酸盐溶液的摩尔浓度;(2)被溶解的二价金属硫酸盐的分子量;(3)硫酸盐中金属的原子量;(4)写出该硫酸盐的分子式。
16. Dissolve 1.8 g of a divalent metal sulfate in water to make it 25 ml. Reaction with dissolved sulfate requires 20 ml of 0.75 M cesium chloride solution. Calculate: (1) the molar concentration of the original sulfate solution; (2) the molecular weight of the dissolved divalent metal sulfate; (3) the atomic weight of the metal in the sulfate; (4) Write the molecular formula of the sulfate.