Problem: Given the following chemical reaction between aluminum sulfide and water; if we are given 65.80 g of Al2S3: a) How many moles of water are required for the reaction? b) What mass of H2S & Al(OH)3 would be formed? Al2S3 (s) + 6 H2O (l) -> 2 Al(OH)3 (s) + 3 H2S (g)