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One definition of a mole is the sum of the average atomic weights (mass) of a compound. In this case

2 Copper + 1 Sulfur = (2 * 63.55) + (1 * 32.07) = 159.17 grams per mole.

So

22 g / 159.17 g/mole = 0.14 mole of Cu2S

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