How many grams of NaCl molecular weight585g mole would you d

How many grams of NaCl (molecular weight=58.5g mole) would you dissolve in water to make a 50mM NaCl solution with 500mL final volume?

50mM NaCl has 0.050 moles NaCl / litre

so
500ml @ 0.050 moles / litre = 0.025 moles NaCl

using molar mass:
0.025 mol NaCl @ 58.44 g/mol = 1.461 g

I would dissolve 1.46 g NaCl into some water,
then add enough water to dilute it to 500 ml