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If you have 2 moles of K+ for every mole of K2S and Molarity (M) is Moles per Liter. Then you know that you have .30 M of K2S. The way that you do that is setting up a series of conversion factors like so:

(.15moles k2s/liter) x (2 moles of K/ 1 mole of K2S) = .30 moles k/ liter.

The moles of K2S cancel out and you are left with moles of K per liter.

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10y ago
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11y ago

0.3M

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10y ago

.30 M

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Q: What is the concentration of K in 0.15M of K2S?
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