Answer :

Willchemistry
Molar mass NaCl = 58.44 g/mol

number of moles

1 mole ------ 58.44 g
? moles ----- 25 g

25 x 1 / 58.44 => 0.4277 moles

Therefore:

M = n / V

M =0.4277 / 1.5

M =  0.285 mol/L

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