How many moles of nacl is needed to prepare 67.3g of 21% solution

The total number of moles for making 21% solution is : .

Explanation:

Given :

If a solution is ''% , it means : of the solute is present in of solution.

Here the solvent is water.

∴

21% Solution :

Since the volume of water doesn't change much as the salt dissolves or ionizes ,

we can assume that we have used of has been used for making this solution.

thus will have :

Thus , number of moles :

Answer :

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