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 :

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i