The molarity of the solution is 2.736 M
calculation
Step 1: find moles of table salt (Nacl)
moles = mass ÷molar mass
from periodic table the molar mass of table salt (NaCl) = 23+35.5 = 58.5 g/mol
moles is therefore = 40 g÷ 58.5 g/mol =0.684 moles
Step 2: find molarity
molarity = moles÷ volume in liters
= 0.684 moles÷ 0.25 L=2.736 M