Need help in calculating chloride % or ppm...

[LabTest57]

For every 1 gram of sodium chloride, how much is pure sodium and pure chloride in percentage? What about potassium chloride at 1 gram as well?

I'm trying to figure out the concentration or ppm of chlorides in my tank water to avoid any lethal levels, which is about 2,540 ppm for short-term exposure and 400 ppm for long-term exposure.

[LabTest57]

So far, I found this on the internet: KCl - Potassium Chloride K - Potassium 52.4%
Cl - Chloride 47.6%

If I have 60 ppm of potassium in a solution, would that mean that I have about 57 ppm of chlorides?

[Tech Support EH]

When calculating the percent composition of any component in a compound, you must keep in mind molecular weights. Here is an example:

To calculate the percent by weight of sodium and chloride in sodium chloride:
-molecular weight Na=22.99; molecular weight Cl=35.45
-Calculate the total mass of Na present:
1 Na is present in the formula, mass = 22.99
-Calculate the percent by weight of Na in NaCl:
%Na = (mass Na ÷ MM) x 100 = (22.99 ÷ 58.44) x 100 = 39.34%
-Calculate the total mass of Cl present:
1 Cl is present in the formula, mass = 35.45
-Calculate the percent by weight of Cl in NaCl:
%Cl = (mass Cl ÷ MM) x 100 = (35.45 ÷ 58.44) x 100 = 60.66%
-39.34 + 60.66=100%

This formula can be followed to determine the percent composition.