How many moles of water does it take to make 477g of lithium hydroixide

2Li + 2H2O ==> 2LiOH + H2

mols LiOH = grams/molar mass = ?
Look at the coefficients. It takes 2 mols H2O to produce 2 mols LiOH; therefore, mols H2O = mols LiOH