If 30ml of hydrogen and 20mlof oxygen react to form water what is left at the end of the reaction

If 30ml of hydrogen and 20mlof oxygen react to form water what is left

1.	If 30ml of hydrogen and 20mlof oxygen react to form water what is left at the end of the reaction
Answer» O2 +2H2------->2H20 we can see that when 1 mole of oxygen reacts with 2 moles of hydrogen you GET 2.moles of water so here 3O ML of hydrogen and 15 ml oxygen will be USED up so 5 ml of oxygen will be left