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To find the amount of silver consumed, we first need to calculate the molar ratio between silver sulfide (Ag2S) and silver (Ag).
The balanced chemical equation for the reaction between silver (Ag) and hydrogen sulfide (H2S) is as follows:
2 Ag + H2S -> Ag2S + H2
According to the balanced equation, 2 moles of silver react with 1 mole of hydrogen sulfide to produce 1 mole of silver sulfide. Therefore, the molar ratio between silver sulfide and silver is 1:2.
Given that 1.20 mol of silver sulfide (Ag2S) was formed, the amount of silver (Ag) consumed can be calculated as:
1.20 mol Ag2S x (2 mol Ag / 1 mol Ag2S) = 2.40 mol Ag
Therefore, 2.40 mol of silver was consumed in the reaction.