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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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