Question

how much positive and negative charge is there in a water molecule ?

Answer 1

H2O pass electric current and it will dissociate to form H+ and OH-

Answer 2

water is pollar molecule , since it has a slight positive charge at one end of the molecule and a slight negative charge at the other end of the molecule
The water molecule consist total of 10 protons and 10 electrons, 8 from the oxygen atom and 1 from rach of the 2 hydrogen atom