How many molecules are in one liter of water

One liter of water contains approximately 6.023 x 10^23 molecules. This number is known as Avogadro's number and is the number of molecules in one mole of a substance. Since water is made up of two hydrogen atoms and one oxygen atom, the number of molecules in one liter of water can be calculated by multiplying Avogadro's number by the molar mass of water (18.015 g/mol). This means that one liter of water contains 6.023 x 10^23 molecules.