Molarity is 1.5 M and the volume is 2 l; thus
The number of moles of NaCl will be given by;
Molarity × volume in liters
= 1.5 × 2 = 3 moles
But 1 mole of NaCl contains 58.5 g/mole
Therefore; the mass of 3 moles will be;
3 × 58.5 = 175.5 g
The mass of NaCl is therefore 175.5 g