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For G23 you find the number of moles of NaCl and KCl, add the moles together and divide by 0.100 L to get the Molarity. This is because there is a 1:1 ratio of moles of NaCl to moles of Cl- and a 1:1 ratio of moles of KCl to moles of Cl-. The molarity of Cl- should be 0.13 M.
Yes, you do have to add the number of moles of Cl- ions together in order to find the concentration of Cl- ions within the solution. More specifically, this can be accomplished by using dimensional analysis to convert the given masses of NaCl and KCl into the number of moles of Cl- ions. You then add these values to find the total number of moles of Cl- ions, which you can substitute into the M = n/V equation along with the given volume to get the final answer.
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