How many grams of H2O are needed to produce 150 g of Mg(OH)2…

Hоw mаny grаms оf H2O аre needed tо produce 150 g of Mg(OH)2? . MW of Mg(OH)2 is 58,02g/mol.  MW of H2O is 18.0g/mol. Show your work to get credits.Mg3N2 + 6H2O →3Mg(OH)2 + 2NH3