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One mole of Na(2)SO(4).10H(2)O is dissol...

One mole of `Na_(2)SO_(4).10H_(2)O` is dissolved in `820` grams of water to make a solution. What is the molality of `Na^(+)` ions in the resulting solution? [Atomic mass `(u):H=1,O=16,Na=23,S=32`]

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