Mg3N2(s) + 6H2O(l) 3Mg(OH)2(s) + 2NH3(g) How many grams of H2O are needed to produce 150 g of Mg(OH)2?

Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(s) + 2NH3(g)How many grams of H2O are needed to produce 150 g of Mg(OH)2?