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NaCl is the formula for Sodium Chloride, from that you can work out the gram formula mass.
RAM Na = 23
RAM Cl = 35.5
gfm (NaCl) = 58.5g mol-1
assuming that you need 0.1l of NaCl
m = 58.5*0.1
= 5.85g
So dissolve 5.85g in water for a 0.2 mole solution
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