Question: how many grams of hydrogen are needed to produce 1.80g of water?
Answer: Another way to look at it is that the proportions of themass of hydrogen in a water molecule to the total mass of themolecule would be 2/18 . For 1.8 g of water this situation is equal to0. 2/1.8 , i.e . you need 0.2 g of hydrogen to produce 1.8 grams ofwater .