How many grams of sodium chloride can be dissolved in 3.6L water to make every 200 water molecules contain 1 Na+ ion?

The molecular weight of sodium chloride is 58.5.

The molecular weight of water is 18.

3.6L water contains 3600/ 18=200(mol).

If every 200 water molecules correspond to 1 sodium ion, then the required sodium ion is 200/200= 1(mol).

According to the molecular formula of sodium chloride, it is NaCL, so the sodium chloride is required to be 1mol, that is, 1*58.5=58.5(g) sodium chloride.

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