how many grams of H2O are needed to produce 150 g of Mg(OH)2?

Question

The formula is Mg₃N₂ + 6H₂O---> 3Mg(OH)₂ + 2NH₃

Answer 1

1. Find how many moles of Mg(OH)2 you have by converting grams to moles (divide 150g by molar mass of Mg(OH)2)

2. Use the mole ratio to find out how many moles of H2O would be needed to make _ moles of Mg(OH)2

3. Convert moles H2O back to grams H2O by multiplying # moles by the molar mass