**Given:**Sea water contains roughly 28.0 g of NaCl per liter.

**To find:** What is the molarity of sodium chloride (NaCl) in sea water?

**Solution: **

Molecular mass of NaCl= 58.4

Therefore 1 mole of NaCl= 58.4 g

Number of moles in sea water= 28/58.4= 0.479

Therefore, 1 litre of water contains 0.479 moles of NaCl

Now, Molarity(M) = Number of moles of solute/ volume of solvent.

Therefore,

M= 0.479/1 = **0.479M**