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Seawater is approximately 4.0$\%$ by mass dissolved ions, 85$\%$ of which are from NaCl. (a) Find the mass $\%$ of $\mathrm{NaCl}$ in seawater. (b) Find the mass $\%$ of Na' ions and of $\mathrm{Cl}^{-}$ ions in seawater.

mass percent of $\mathrm{NaCl}=0.034$ or 3,4 percent

mass percent of $\mathrm{Na}^{+}$ in the seawater $=0,0134$ or 1,34 percent

mass percent of $\mathrm{Cl}^{-}$ in the seawater $=0,0206$ or 2,06 percent

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