1. Calculate the moles of NaCl:

* Molar mass of NaCl: 58.44 g/mol (approximately)

* Moles of NaCl: (0.5 g NaCl) / (58.44 g/mol) = 0.00855 mol NaCl

2. Calculate the molarity:

* Molarity (M): moles of solute / liters of solution

* Molarity: (0.00855 mol NaCl) / (0.05 L solution) = 0.171 M

Therefore, the molarity of the NaCl solution is 0.171 M.