Given :
Sodium chloride is 39.0% sodium by mass.
To Find :
How many grams of sodium chloride are needed to have 750. mg of sodium present.
Solution :
750 mg sodium = 0.75 gm sodium.
Since, sodium percentage is 39.0% .
39 gm of sodium is present in 100 gm of NaCl.
Let, mass of NaCl required is x.
So, mass of NaCl required to produce 0.75 gm of sodium is :
[tex]39x = 100\times 0.75\\\\x = \dfrac{75}{39}\ g\\\\x = 1.92\ gm[/tex]
Therefore, mass of NaCl required is 1.92 gm.
Hence, this is the required solution.
