What mass of kbr (in grams) should you use to make 300.0 ml of a 1.50 m solution of kbr?

Mass  of  kbr  which  should  use  to  make  300ml  of  a  1.50m  solution  of  kbr  is  calculated  as  follows

step  one  calculate  the  number  moles   of  Kbr
that  is   (1.50  x  300) /1000=0.45  moles
mass= molar  mass  x  moles
119  g/mol   ( molar  mass of  Kbr)  x  0.45 moles=  53.55g

Because a model would make the investigation easier to understand