Molar concentration of Sodium chloride (NaCl) means the number of moles of sodium chloride present in 1L of water.
Molar mass of NaCl = Molar mass of Na + Molar mass of Cl
Molar mass of NaCl = 23 + 35.5
Molar mass of NaCl = 58.5g
∴ 1L of water contains 55.55 moles of water. Hence,
Mass of ocean water = 55.55 × 18 = 999.9g
Since, 1L of ocean water has a mass of 999.9g of which 3.5% is the salt.
hence, (999.9) (0.035) = 34.99g
So, No. of moles of NaCl = Mass of NaCl / 58g NaCl per mol
No. of moles of NaCl = 34.99/58.5
No. of moles of NaCl = 0.59 moles
So, Molar concentration or Molarity would be 0.59 moles present in 1L of solution.
Hence, Molarity or Molar Concentration = Moles of NaCl/ Volume of solution (in L)
Molarity = 0.59/1L
⇒ Molarity = 0.59M
Hence, the molarity is 0.59M
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