How many moles of water can you form from 4 moles of hydrogen and excess oxygen

2H2 + O2 = 2H2O 2 moles forms 2 moles of water 4 moles will form 4 moles.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom