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几道英文版的化学题,1.A solution is labeled "0.450M magnesium nitrate.

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几道英文版的化学题,
1.A solution is labeled "0.450M magnesium nitrate." Calculate the concentration of each ion present in solution.
2.Calculate the number of moles of KOH in 150.0 mL of a 0.500M KOH solution.
3.Cauculate the new concentration when 50.0mL of water is added to 725.0mL of 1.25M NaCl.
- - 第一题 硝酸根0.9mol每升 mg离子0.45mol每升
第二题0.075mol
第三题怎么有小数点 .1.17