how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

1) find the mole of NaBr in from the solution you want to prepare using c=n/v where c is concentration in mol/L, v is the total volume in mL.

2). find the mass in grams using m=nMr where the mole is in step 1.

the mass in step 2 is the mass of NaBr needed to be weighed on analytical mass balance and dissolved in a 600mL volumetric flask with distilled water.

hope that helps