What is the pH of a 4.7 * 10 - 9M HCl solution?

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

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

The answer is not c

Ibelieve the answer 4 moles