Q. 5 A5.0( 1 Vote )

500 mL of a 1M solution of common salt is taken.

How many grams of common salt are dissolved in this?

Answer :

Given: Volume of solution of NaCl (common salt) = 500mL

= 0.5L


Molarity of solution = 1M



We can write,


Number of moles = Molarity × volume in litres


Number of moles = 1M × 0.5L


Number of moles = 0.5


Now, to find the mass in grams, apply the formula given:



Gram molecular mass of NaCl = GMM of Na + GMM of Cl


= 23g + 35.5g


= 58.5g


Therefore,



Mass of NaCl in grams = 0.5 × 58.5g


Mass of NaCl in grams = 29.25g


Thus, 29.25 grams of common salt are dissolved.


Note: If one litre of the solution contains 1mol of solute, it is called 1M (molar) solution.


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