What is the mass of a liquid having a
density of 1.40 g/mL and a volume of
3090 mL?

U whay do you need with?

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

I’m pretty sure it’s filtration