You need the density.
1.8% NaCl (by mass or w/w) means 1.8 g NaCl/100 g solution.
1.8g NaCl/molar mass NaCl = moles NaCl.
Then 100 g solution converted to mL from the density. volume = 100 g/density and convert mL to L.
M = moles/L.
How to determine the molarity of a 1.8% NaCl solution.
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