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We did this during discussion but I didn't understand something. When going from grams to moles, he did 0.500 g K2S / 110.27 g * 2 mol K / 1 mol KCl. What was that 2 mol K per 1 mol KCl part? When do we need to do that?
The question is asking about the concentration of potassium ions. So, it is necessary to consider how many moles of potassium ions there are per mole of substance so your answer is calculated correctly and has the correct units. However, there are not 2 mol K per 1 mol KCl, so I'm guessing it was supposed to be 2 mol K per 1 mol K2S, the other substance in the problem.
2 mol K/ 1 mol compound isn't actually applicable for KCl as there would only be 1 mol K for 1 mol KCl. However for K2S, you would have 2 mol K for each mole of the compound. Likewise there would be 3 mol K for each mole of K3PO4
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