Problem: Be sure to answer all parts. Calculate the maximum numbers of moles and grams of H2S that can form when 138.7 g of aluminum sulfide reacts with 143.0 g of water: Al2S3 + H2O → Al(OH)3 + H2S [unbalanced] What mass of the excess reactant remains? 

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Be sure to answer all parts. 

Calculate the maximum numbers of moles and grams of H2S that can form when 138.7 g of aluminum sulfide reacts with 143.0 g of water: 

Al2S3 + H2O → Al(OH)3 + H2S [unbalanced] 

What mass of the excess reactant remains? 

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