nitric acid is formed by the reaction of nitrogen dioxide with water. how many moles of water are needed to react completely with 8.4 moles of nitrogen dioxide? 3 NO2 + 1 H2O > 1 NO + 2 HNO3

False, as a substance changes from a solid to a liquid and from a liquid to a gas the molecules get farther apart from each other

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.