solution calculations

1. prepare 500 ml of a 0.04 M solution of NAOH

a. how many g. of solid NaOH are required?

b. 0.04 M =

= ? N

= ? g/liter

= ? % (w/v)

= ? mg%

2. prepare 2 liters of a 3 Osm solution of MgCl2, assuming 100% dissociation.

a. how many g. of solid MgCl2 are required?

b. 3 Osm=

= ? M

= ? g/liter

= ? % (w/v)

please show calculations!