Can someone pls help on b and c

Given that the molar mass of nano3  is 85.00  g/mol, what mass of nano3  is needed to make 4.50  l of a 1.50  m nano3solution? use  .6.75 g18.9 g255 g574 g

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

Nonpoint source pollution is difficult to control because it