求下列化学符号：氮元素、硝酸根离子、2个银原子、干冰、铝土矿的主要成分?

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• 求下列化学符号：氮元素、硝酸根离子、2个银原子、干冰、铝土矿的主要成分?
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• 写出下列化学用语或符号的意义2个氢原子 2个氮分子 2个水分子 2个镁离子 2个硫酸根离子 +6价的锰元素 +5价磷的氧化物 2H 3OH-(-是在右上角处）Ca+2（+2是在正上方） 2H22 某物质的化学式为R2O3,其中R元素的质量分数为百分之70,则R2O3的相对分子质量为多少?3 某+2价金属的氧化物的相对分子质量为40,则它与硝酸根形成化合物的相对分子质量是多少?4 现在有200t天然水,经实验测得氢元素的质量为22t,试求天然水的纯度?
• 英语翻译The relation of man to his environment is the relation of the historian to his theme.The historian is nether the humble slave,nor the tyrannical master,of his facts.The relation between the historian and his facts is one of equality,of give-and-take.As any working historian knows,if he stops to reflect what he is doing as he thinks and writes,the historian is engaged on a continuous process of moulding his facts to his interpretation and his inter
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