WE KNOW THAT
Molarity = Number of mole of solute/Volume of solution.
       M= Number of mole of
NaCl / Volume of solution.
     0.100 = Number of mole of NaCl
/0.250L.
       Than
            Â
Number of mole of NaCl = 0.100*0.250
                                                           Â
= 0.0250.
     SO Mass of NaCl = mole* molecular
weight
                    Â
                  0.0250*58.4
=1.46g