4 g of hydrogen reacts with 20 g of oxygen to form water. What is the mass of water formed?
4 g 32 g 36 g
When 4 g of H2 reacts with 32 g of O2 gives 36 g of H2O.
Now present oxygen is 20 g
So, O2 will be the limiting reagent and H2O will be calculated from O2
32 g of O2 given = 36 g of H2O
20 g of O2 given = = 22.5 g H2O